thymic 
thymic (tin' inik), a. Of or pertaining to the '.'I" . .'' .>"' 
0325 
thymuH gland: as, the thi/mir vein. Thymic 
asthma. Maine as larynffigmu* striduliu. 
thymol itl'moll. . |< H/I/HH + -/. j The phe- 
nol of I'j-mene, C, II , ; ,.< HI, ;i stejiroptene ob- 
tainnl from oil of thyme by <li*l illat ion. It Is a 
crystalline solid having a poWxU o.loi and i 
llliil cullstic tu-te, lint its solution snmri.nl]> diluted h: 
the Hiuell of tli>nn,' and ;in agreeable coolhiK taste. It lit 
lightly soluble in water, readily soluble in nlculliil. It Is 
povnfttll) antiseptic in its i>i opei ties, !in<l is used in med- 
icine :i- a dressing for unhealthy uoiinds or sores. 
ThyniUS 1 (Ihi'mus), . [M.. (Kiviims, Hi!)0), < 
\j. Ill ij in n in, < dr. tli/vii; Hi'fioi;, tliyinc : SIT thyme.] 
A genus of labiate plants, belonging to the 
tribe Siitni-ihii'ir ami sulitribe Mcnthmdex; the 
thyme. It is characterized by axillary or spiked few-tluw- 
cre<l vertlclllaalurs, a distinctly two-lipped, ten- to thir- 
teen-nerved calyx closed within by hairs, and a slightly 
two-lipped corolla with four perfect stumcns. There are 
about 40, or an some class them 100 species, nearly all 
natives of the Mediterranean region, a few in the Canary 
Islands and Abyssinia, and one or two widely dispersed 
over the tempi-lute and northern parts of Europe and Asia. 
They are small shrubby plants, with entire leaves small 
and nearly alike throughout, or in the spike changed into 
IUH Is also represented In Australia See 
..i eui under bay-worm. 
thyro-aryepiglotticus (thi r<~> nr i-ep-i-glot'i- 
kns,, n. [NL., iis llii/rn(iil) + iiiiii/i mild) + 
, liiilliitti.*. \ Same as Ihyrii-iirytenoid muscle 
(which see. miller thijro-nrijti-iiiiid). 
iry* acrid thyro-arytenoid (thi rd-ar-i-te'noid), . 
+ iiri/tniiiiil.] Of or pertaining to 
the thyroid and arytenoid cartilages. Thyro- 
arytenbld folds or ligaments, the vocal cords, (a) /;.- 
feriirr, a strong elastic band passing on either side from 
the angle of the thyroid cartilage to the anterior angle 
of tile base of the arytenoid cartilage. It Is covered with 
thin mucous membrane, and forms the true vocal cord. 
(6) Superior, a delicate fibrous band of elastic tissue on 
either side, passing from the angle of the thyroid cartilage 
to the anterior surface of the arytenoid cartilage. It is 
covered with mucous membrane, and forms the so-called 
false vocal cord. Thyro-arytenoid muscle, a broad, 
flat muscle on either side of the larynx, passing from the 
angle of the ala> of the thyroid cartilage and the crlco- 
thyroid membrane, to be Inserted Into the base and an- 
terior surface of the arytenoid cartilage. It Is divisi- 
ble Into an Inferior or Inner portion, adjacent and parallel 
to the vocal cord, and a superior and outer portion. This 
muscle, Innervated by the Inferior laryngeal nerve, re- 
laxes the vocal cord. 
bracts, the (lowers in separate axillary whorln or In loose or !,___ -_~f nni<1oiio lt\\\ rf. ni-'i mii'iir>.nv) 
compact terminal spikes. The species nre known in gen- tnyTO-arytenOldeuS ( ro-ar l-te-nm i i- . 
eral as thyme. See also mastic-herb, and cut under Hamen. [NL.: w* thyr<>-arytruoul.] The thyro-ary- 
hymus^ (thi'mus), . [NL., < Gr. Oi'finf, m., a 
warty excrescence, a glandular substance, the 
Thysanocarpus 
of the thyroid ails, passing beneath the great cervical ves- 
sels to be distributed to the lower part of tlic thyiold |l> . 
to the icalenus antlcui, longus colll, Inferior constrictor, 
and the Infrahyotd muscles, and giving of! the ascending 
cervical, Inferior laryngeal, trachea), and esophageal 
branches. Thyroid axis. See axit'.- Thyroid body, 
the so called thyroid gland. See below. Thyroid carti- 
lage the largest cartilage of I he larynx, situated between 
the hyold bone and the crtcold cartilage, and composed 
of two lateral halves, or aim, continuous In front, where 
they form the projection known as Aitam'iappU. It artic- 
ulates with the epiglottis and the crlcold and other laryn- 
geal cartilages, ana affords attachment to the vocal cords. 
See cut under lari/iu Thyroid dislocation, in uro., 
dislocation of the head of the thigh bone or femur in 
thyroid or obturator foramen. Thyroid foramen. See 
</'. Thyroid ganglion, se. .,.,//.,. Thyroid 
gland, large and very vascular body, consisting chiefly 
of a congeries of blood-veaaels, but not provided with a 
duct or known to furnish any secretion, saddled upon the 
larynx and upper purl of the trachea. Its functions, If It 
have an/, are unknown ; It takes no part in respiration, 
though associated with the windpipe, and Is apparently a 
vestigial organ, or the remains of some undetermined func- 
tional homologue of the lowest vertebrates. It Is the salt of 
the disease known aa brimchitrfle or gutter, becoming some- 
times enormously enlarged. Thyroid vein. See win. 
II. n. I. The thyroid cartilage. 2. The 
thyroid gland. 3. A thyroid artery, vein, or 
tenoid muscle Thyro-arytenoldeus superior. 
Same as arytenoideut. 
sweetbread: so called because likened"to V "a thyro-epiglottic (thi-ro-ep-i-glot'ik), o. [< 
bunch of thyme, < Ov/iov, K'/u>s, thyme: see thyro(til) + epiglottis + -<.] Pertaining to the 
thyme.] 1. In tuntt., a fetal structure, vestigial 2ES2i Cartilage ?"<} th> ' -fl"*? 10 " -Thyro- 
in-'tlJ adult, one of the so-called' ductU SttttBB&tK&TCYKiS 
glands, of no known function, situated inside uuje, just below the median notch of the latter, 
the thorax, behind the breast-bone, near the thyro-epiglottidean (thi-ro-ep'i-glo-tid'e-an), 
root of the neck. The thymus of veal and lamb Is a . [< thyro(id) + epiglottis (-id-) + -t-an.] 
called tietftbread, and more fully throat or nedc-neeet- 
hrruil. to distinguish it from the pancreas or stomach- 
sweetbread. 
2. Inpathol., same as acrtithyiiiion. 
thymy (ti'mi), a. [< thyme + -w 1 .] 1. Abound- 
[< thyroid + -al.] 
[< thyroid + *- 
ing with thyme ; fragrant with thyme. 
Love paced the thymy plots of I'aradise. 
Tennygon, Love and Death. 
Pertaining to the thyroid cartilage and the epi- 
glottis Thyro-epiglottidean muscle, a delicate fas- 
ciculus arising from the Inner surface of the thyroid 
cartilage, just external to the origin of the thyro-arytenoid 
muscle, spreading out on the outer surface of the sacculus 
laryngls, some fibers extending to the aryteno-epiglottid- 
eaii (old, others to the margin of the epiglottis. It is in- 
nervated by the Inferior laryngeal. Also called deprettor 
2. Resembling thyme; of, pertaining to, or thyro-epiglottideus (thi-ro-ep'i-glo-tid'e-us), 
characteristic of thyme: as, a thymy smell. . .,1 tliyro-ciiif/lottidei (-i). [NL.: see ihyro- 
Thynnidse (thin'i-de), n. pi. [NL. (Enchson, MfaMWsWM.] ' The thyro-epiglottidean mus- 
1842), < Thynnus + -idle.] 1. In entom., a curl- cle ( wn ich see, under thyro-epiglottidean). 
ous family of hymenopterous insects, occurring thyroglottideus (thiro-glo-tid'e-us), n. ; pi. 
in South America and Australasia, aud allied thi/roolnttideit-i). Same as thi/ro-epiglottideits. 
n. [* thyro(id) + hy- 
and anat., a bone de- 
postoral visceral arch of 
the embryo of higher vertebrates, correspond- 
ing to the first branchial arch of fishes and am- 
phibians, (a) In man and other mammals, the greater 
cornu of the hyold bone. See first cut under JhiUi. (6) 
In a bird, sometimes, one of the long horns of the hyold 
bone, which curl up behind the skull, and in some wood- 
peckers even up over the top of the skull to the eye or 
nostril, consisting each of two pieces properly named 
ceratobranehial and epibranehial. The ceratobranchials 
Inous projections, as in some Chnjxididx. More than 60 
species are known. 
2f. In iclith., a family of scombroid fishes; the 
tunnies. See Thynnus, 2. 
Thynnus (thiu'us), . [NL., < L. thynnus, thun- 
ii n.i, < Gr. ffiwos, a tunny: so called from its 
quick, glancing motions, < Ovvctv, Ovctv, dart 
along. Cf. tunny."] 1. In en torn., a remarkable 
genus of hymenopterous insects, typical of the and cpibrancnlals together are badly called the thyrohyalt, 
family r/ ( .vW*..The species are Australian. Mliim^'m^mmm 
FabrMus, 1775. 2f. In ichth., a genus of scom- 
broid fishes, so named by Cuvier in 1817; 
tunnies. Being preoccupied in entomology 
name was changed by Cuvier in 1829 to Orcy- 
nus. See cut under albacore. 
Thyone (thi'o-ne), n. [NL. (Oken, 1815).] 1. 
The typical genus of Thyonidx.Z. A genus 
of crustaceans. 
Thyonidse (thi-on'i-de), n. pi. [NL., < Thyouc 
+ -ids:] A family of pedate holothurians, typ- 
ified by the genus Thyone, having suckers 
scattered over the surface of the body. They 
are sometimes called sea-cacti. 
thyreoid (thi're-oid), a. and n. Same as thyroid. 
thyreopalatinus (thi're-o-pal-a-ti'nus), n. ; pi. 
thi/rropalatini (-m). [NL!, as tfiyreo(id) + pala- 
liiir-.] Same as palatophtiryngeus. 
thyreopharyngeus (thi're-o-far-iu-je'us), n.; 
pi. tliiii-rojiltiiritngei (-i). [NL.,as thyreo(id) + 
pharynx.] Same as constrictor pharyngis in- 
ferior (which see, under constrictor). 
Thyreus (thi're-us), n. [NL., < Gr. 0y>r<if, a 
large oblong sh'ield.] A genus of hawk-moths, 
of the fnmilv 9phingidM. T. abbotiis the Abbot's 
sphinx, a duU-chocolate or grayish-brown moth with 
brown and sulphur-yellow hind wings. Its larva feeds 
upon the grape-vine, and has two marked coloratlonal 
forms, one green and one brown. The caudal tubercle is 
polished black with a yellow annulus, and the venter is 
yellow with pink spots between the prolegs. See cut 
under *pkinx. 
Thyridopteryx (thir-i-don'te-riks), n. [NL. 
i Si ephens, 1835), < Gr. Apg (<h>pif-), dim. of 
Oupa, a door, + T7t/;, a wing.] A genus of 
moths, of the family l'.ii/i-h!<l;r. Tin- common bag- 
worm of the t'nited States Is the larva of T. fphemtrm- 
formix. The female is wingless: the mule abdomen is ro- 
bust, and extends for. some .listam.' b.liin.l the hind wings; 
and the male aiitemue are luuadh 'pectinate almost to the 
i 1 n 8 1817 8 - C the thyrohyoid (thi-ro-hi'oid), a. and ,i. [< thy- 
ro(id) + hyoid.] I. a. In anat., of or pertaining 
MnOIOgy. the . ., , j !.__ .) >. n,,:,! H rtila<rB 
to the hyoid bone and the thyroid cartilage. 
Thyrohyoid arch, the third postoral visceral arch. 
Thyrohyoid ligament, a round elastic ligament passing 
from the superior cornu of the thyroid cartilage to the 
extremity of the great cornu of the hyold bone. Also 
called lateral thyrohyoid ligament, in distinction from the 
thyrohyoid membrane. See cut under larynx. Thyro- 
hyoid membrane. See membrane, and cut under larynx. 
Thyrohyoid muscle, a muscle extending from the 
oblique ridge on the outer side of the thyroid cartilage 
to the great cornu of the hyotd bone : Innervated from 
the hypoglossaL See cut under muMfel. Thyrohyoid 
space, the depressed space between the thyroid carti- 
lage and the hyold bone in front. 
II. w. A small muscle of man and some other 
animals, apparently a continuation of the ster- 
nothyroid, arising from the thyroid cartilage 
of the larynx and inserted into the hyoid bone. 
Its action approximates the parts between 
which it extends. See cut under muscle^. 
thyroid (thi'roid), a. and . f Also, and prop., 
thyreoid; < Gr. Svpeoeiafc, shield-shaped (%6v- 
" : the thyroid cartilage), < " 
large oblong shield (< Oi'pa, door), + riifof, form, 
shape.] I. a. Shield-shaped. Specifically (a) In 
anat.. noting the largest and principal one of the several 
cartilages of the larynx, and several associated part* ; also, 
noting the obturator foramen and obturator membrane. 
(6) In zoM., noting shield-shaped color-markings, or birds 
having a thyroid marking: as, the thyroid woodpecker, 
Sphyropicut thymideiu. Cornua of the thyroid carti- 
lage. See i-..r. Isthmus of the thyroid gland. See 
fiuEsMO. Oblique line of the thyroid cartilage. See 
oblique. Pyramid of the thyroid gland. See pyramid. 
Thyroid artery, either of two arteries distributed to 
the region of the tlnroU cartilugc and thi mid body, (a) 
s<: r . rir, A branch of the external carotid, distributed to 
the stern, it hyrnid, sternohyold.aiid.imoh\..i.i inuscleiand 
the thyroid hoily, and giving .It the hyoid, sternomastold, 
laryiiBeal, and cricothyroid branches. (/O/n/mor, a branch 
thyroidal (thi'roi-dal), 
Same as thyroid. 
thyroideal (thi-roi'de-al), a. 
-al.] Same as thyroid" 
thyroidean (thi-roi'de-an), a. Same as thyroid. 
thyroidectomy fthi-r'oi-dek'to-mi), n. [< thy- 
roid + Gr. eicroftt/, a cutting out.] Excision of 
a part or the whole of the thyroid gland or of 
the thyroid cartilage. 
thyrotbmy (thi-rot'o-mi), n. [< thyro(id) 
Gr. -rofiia, < rtfivtiv, ra/iciv, cut.] In surg., divi- 
sion of the thyroid cartilage, 
thyrse (there), n. [= F. Uiyrse, < L. thyrsus, < 
Gr. Bi'paof, a stalk, stem : see thyrsus.] 1 . Same 
as thyrsus, 1. 
Wild I am now with heat ; 
O Bacchus ! coole thy rales ! 
Or frantlck I shall eate 
Thy thyrte, and bite the bayes. 
Hemclt, To Live Merrily, and To Trust to God. 
2. In bot., a contracted or ovate panicle, being 
a mixed or compound form of inflorescence in 
which the primary ramification is centripetal 
and the secondary or ultimate is centrifugal. 
The Inflorescence of tne horse-chestnut and that of lilac 
are typical examples. Also thyrma and cymubntrys. See 
cut under .Esculiu. 
3. A small earthenware vessel, of a form re- 
sembling that of a pine-cone, especially such 
a vessel of ancient make. 
From their resemblance to pine cones they have been 
called thynfn, and are supposed to have been used for 
holding mercury. 
R. H. Smith, 8. K. Handbook, Persian Art, p. 12. 
thyrse-flower (thers'flou'er), n. A plant of 
the acanthaceous genus Thyrsacanthus. 
thyrsi, . Plural of thyrsus. 
thyrsifbrm (ther'si-f&rm), a. [< L. thyrsus, a 
thyrsus, -I- forma, form.] In bot., resembling 
or'having the form of a thyrse. 
thyrsoid (ther'soid), a. [< Gr. ft'/xrof, a stalk, 
stem, + rMoc, form.] In but., having somewhat 
the form of a thyrse. Also cymobotryose. 
thyrsoidal (ther'soi-dal), a. [< thyrsoid + -al] 
Same as thyrsoid. 
thyrsus (ther'sus), H.; pi. thyrsi (-si). [< L. 
thymus, < Gr. fopoof, a stalk or stem, the Dionys- 
iac wand.] 1. One of 
the most common at- 
tributes or emblems of 
Dionysus (Bacchus) 
and his thiasus and vo 
taries. It was a staff tipped 
with an ornament like a pine- 
cone and sometimes wrapped 
round with Ivy and vine- 
branches, and appears In r- 
rlous modifications in ancient 
representations. The bac- 
chantes carried thyrsiln their 
hands when they celebrated 
their orgies. Also Utyrte. 
2. Same as thyrse, 2. 
Thysanocarpus (this'- 
ii-no-kar'pus), n. [NL. 
i\V..I. Hooker, 1833). so 
called from the pods 
which hang like tassels ; 
< Gr. Oi'oavof , a tassel, + 
jcajwroc, fruit.] A genus 
of cruciferous plants, of 
the trilie Imitidfir. It Is 
characterized by a small one- 
seeded winged silicle, often 
with a perforated margin, 
by accumbent cotyledons, and stamens without appen- 
dages. There are about 6 species, natives of California and 
Thynus. From cast of a vmte 
with anrhaistic reliefs, in the Mu- 
seum of Fine Arts, Rotten. 
