tactility 
tactility (tak-til'i-ti), H. [< tactile + -ity.] 1. 
The state or property of being tactile; capabil- 
ity of being touched, or of being perceived by 
the sense of touch; tangibility; palpability. 
2. Touchiness. [Humorous and rare.] 
You have a little infirmity tactility or touchiness. 
Sydney Smith, Letters, 1831. (Davies.) 
tactinvariant (tak-tin-va'ri-ant), . [< L. tnc- 
tus, touch (see tact), 4- E. itirariant.] In alg., 
the invariant which, equated to zero, expresses 
the condition that two curves or surfaces touch 
each other. 
taction (tak'shon), w. [= F. faction, < L. tuc- 
tio(n-), a touching, touch, < tungerc, pp. tactus, 
touch: see tact, tangent, ] 1. The act of touch- 
ing, or the state of being touched ; touch ; con- 
tact; palpation. 
They neither can speak, nor attend to the discourses 
of others, without being roused by some external taction 
upon the organs of speech and hearing. 
Sivi.fl, Gulliver's Travels, iii. 2. 
2. The tactual faculty; the sense of touch, or 
its exercise; perception of objects by feeling 
them. 3. In yeom., same as tangeticy. 
tactless (takt'les), . [< tact + '-less.'] Desti- 
tute of tact ; characterized by want of tact. 
People . . . goaded by tactless parsons into hardness 
and rebellion. F . P. Cobbe, Peak in l)arien, p. 234. 
tactlessness (takt'les-ues), . Want of tact; 
lack of adroitness or address. Atlieneenm, No. 
3235, p. 555. 
lactometer (tak-tom'e-ter), n. [< L. tactus, 
touch (see tact), + Gr. ficrpov, measure.] In 
ined., an instrument for determining the acute- 
ness of the sense of touch; an esthesiometer. 
tactor (tak'tor), n. [NL., < LL. tactor, a touch- 
er, < L. tangere, pp. tactus, touch: see tangent.'] 
An organ used as a feeler; an organ of touch. 
Lehmen considered that the antennae were necessarily 
employed as factors. 
Westwood, Modern Classification of Insects. 
tactual (tak'tu-al), a. [< NL. "tactualis, < L. 
taetits, a toucning, touch: see tact.] 1. Com- 
municating or imparting the sense of touch; 
giving rise to the feeling of contact or impinge- 
ment. 
Every hair that is not too long or flexible to convey to 
its rooted end a strain put upon its free end is a rudi- 
mentary tactual organ. //. Spencer, Prin. of Biol., 295. 
2. Arising from or due to touch ; impressed or 
communicated by contact or impingement ; re- 
lating to or originating 
My inference of the tactual feeling may be right or 
wrong, the feeling may or may not follow my outstretched 
hand. G. H. Lewes, Probs. of Life and Mind, II. 374. 
No optical illusion, no tactual hallucination could hold 
the boy who took all the medals at the gymnasium. 
E. S. J'helps, Beyond the Gates, p. 88. 
tactually (tak'tu-al-i), 11. By means of touch ; 
as regards touch. "Science, III. 587. 
tactus (tak'tus), H. [L.:seetoci.] The sense 
of touch; taction Tactus erudltug, in med., the 
skilful touch ; an experienced sense of touch acquired by 
practice, as in digital exploration in labor-cases and other 
delicate manipulations. 
tacuacine (tak'wa-sin), . [South American.] 
The South American crab-eating opossum, Di- 
delpliys cancrirora. fincyc, Brit., XI. 240. 
tad (tad), n. [Perhaps an abbr. of tadpole.} A 
very small boy, especially a small street-bov. 
[Colloq., U. S.] 
tad-broom (tad'brb'm), ti. The scouring-rush 
and other species of Eqnisetmn. Britten and 
Holland. [Prov. Eng.] 
taddet, n. A Middle English form of toad. 
taddepolt, . A Middle English form of tadpole. 
tade (tad), n. A Scotch (and obsolete English) 
form of toad. 
Tadorna (ta-dor'na), n. [NL. (Fleming, 1822; 
Leach, 1824; earlier in Belon, 1585), < F. teutonic, 
a sheldrake ; ori- 
gin obscure.] A 
genus of Anat- 
idx, of the sub- 
family Anatime; * 
the sheldrakes or 
barrow-ducks. 
See cut under 
sheldrake. Also 
called Vulpanser. 
tad-pipe (tad'- 
pip), K. Same 
as toad-pipe. 
tadpole (tad'- 
pof),w. [<ME. 
tadpolle, tadde- 
pol, < tadde, a 
0156 
ened vowel, of fade, toad, + jtolle, head, poll: 
see toad and poll 1 . Of. E. dial, pollliead (Sc. 
jHiicltead), polliirog, polliwig, etc., a tadpole.] 
1. The larva of a batrachian, as a frog or toad, 
from the time it leaves the egg until it loses its 
gills and tail. The name is chiefly the popular desig- 
nation of the young of anurous batrachians, when the head 
and body form a rounded figure with a long tail, used like 
a fish's to swim with, and the creatures live in the water 
and breathe by gills. They gradually sprout their legs, 
drop or absorb their gills and tail, and come on land to 
breathe air. The term is also used of any other larvae of 
amphibians in which the metamorphosis is less complete, 
as of newts, efts, or salamanders. 
2. The hooded merganser, Lopliodytes cucul- 
Ifitnn: doubtless so called from the apparent 
size of the head. See the quotation under nioss- 
head. G. Trumbult, 1888. [Florida.] 
tadpole-fish (tad'pol-fish), . A fish with a 
large head like a tadpole's; the tadpole-hake. 
tadpole-hake (tad'pol-hak), n. The tri fur- 
cated hake, a gadoid fish, Bnnieeps raniinis (or 
tt-ifureatus), of the North Atlantic waters of 
Europe, of a dark color and about a foot long. 
Also called tadpole-Jish, lesser forkbeard, and 
tommy-noddy. See cut under Baniceps. 
tae 1 (ta), n. A Scotch form of toe. 
Tak care o' your taei wi' that stane ! 
Scott, Antiquary, xxv. 
tae 2 (ta), prep. A Scotch form of to 1 . 
tae a (ta), a. [Sc., also tea; in the phrase the tae, 
orig. thet ae, i. e. that one : see that and one, o 2 , 
ae. Cf.tother in the tother,toT that other.] One: 
as, the tae half or the tither (the one half or the 
other). [Scotch.] 
taed (tad), w. A Scotch form of toad. 
taedium (te'di-um), . [L,.: see tedium.] Weari- 
ness; irksomeness; tediousness. See tedium. 
Taedium vitae, weariness of life ; ennui ; Inpathd., a deep 
disgust with life, tempting to suicide. 
tael (tal), M. [Formerly also taile; also tale, 
tayel; = F. tael, < Pg. tael, < Malay tail, taliil, 
a weight, tael, prob. < Hind, tola, a weight: see 
tola.] 1. The Chinese Hang or ounce, equal to 
1J ounces avoirdupois. See Hang. 2. A Hang 
or ounce of ' ' sycee," or fine uncoined silver: the 
unit of monetary reckoning in China. The tael is a 
money of account (not a coin), and is divided into 10 mace, 
or 100 candureens. Its value varies with the fluctuations 
in the price of silver bullion. At present(1891) it is equal 
toaboutSl.OSUnitedStatesgold. One thousand Mexican 
dollars equal 720 taels. See liang, mace, and candareen. 
Halkwan tael, literally 'custom-house tael,' the stan- 
dard weight recognized by the customs authorities of 
China in their monetary transactions. 
ta'en (tan). [Formerly also tane, ME. tan, etc. : 
see take."] A contraction of taken, past partici- 
ple of take. 
taenia (te'ni-a), w.; pi. tsenise (-e). [Also tenia; 
NL., < L. txiiia, < Gr. ratvia, a band, fillet, rib- 
bon, tape, tapeworm, < relvetv, stretch, extend: 
see til in.] 1. In classical archxot., a ribbon, 
band, or head-band; a fillet. 
Twisted fillet of the athletes and of Hercules consists of 
several tteniie of different colours. 
C. 0. Miiller, Manual of Archteol. (trans.), 340. 
2. In arch., the fillet or band on the Doric archi- 
trave, which separates it from the frieze. 3. In 
surg., a long and narrow ribbon used as a liga- 
ture. 4. In anat., a band or fillet: specifically 
applied to several parts of the brain, distin- 
guished by qualifying epithets. 5. In zoiil. : 
Tseniocampa 
COli, the longitudinal muscular bands of the colon. Also 
called ligaments of the colon. Taeriia hippocampi. See 
corpus Jbnbriatuin, under corpux. Taenia pontis, a fas- 
ciculus of white substance which seems to break away 
from the pons at its anterior border, and, running down- 
ward over the eras, applies itself again closely to the pons 
as it nears the middle line. Tsenia Tarini, a thickening 
of the lining of the ventricle of the brain over the vena 
Galeni : named by Erasmus Wilson from Pierre Tarin 
(1'etrus Tarinus), who first described it in 1750. Taenia 
thalami, a thin lamina extending from the stria mednl- 
laris thalami to form the thickened border of the roof of 
the third ventricle. Also called tenia ventriculi terlii. 
Taenia ventriculi quarti. Same as Kyula, X. 
taenia-chain (te'ni-ii-chan), . The whole or 
any considerable number of the joints of a tape- 
worm. 
taeniacide (te'ni-a-sid), n. Same as teenicidv. 
Taeniada (te-m'a-'da), . pi. [NL., < Txnia + 
-ada.] An order ofPlaty/ielmintlia or Scolecida, 
containing the cestoid worms, now usually- 
called Cestoda or Cestoidea. Wee cut under 
CesMdee. 
taeniafuge (te'ni-a-fuj), . Same as tee>iifu(/<: 
tsenia-head (te'n'i'-a-hed), n. The seolex of a 
tapeworm in any stage of its development ; the 
worm itself, without the deutoscolices or pro- 
glottides which successively bud from it, and 
which in adult tapeworms form all but the first 
one of the very numerous joints of the worm. 
Tfenia-heads in various stages of development are figured 
under teuia. In adult taenite the head serves, by means of 
hooks or suckers, or both, to affix the parasite to the host. 
Such a taenia-head, with one joint attached, is figured 
under cestoid. Another head, together with very numer- 
ous joints, is shown under tapeworm. 
Taeniata, Taeniatas (te-ni-a'ta, -te), 11. pi. 
[NL., neut. or fern. pi. of "tseiiiatus: see tee- 
mate.] A division of CteNophora, containing 
those comb-jellies which are of slender ribbon- 
like form, as the Venus's-girdles, or Cestidx. 
See cut under Cestiim. The term is correlated 
with Saccatse, Lobata, and Eurystomata. 
taeniate (te'ni-at), a. [< NL. "teeniatits, < L. 
txnia, a baud, fillet : see tfeiiia.] In anat., rib- 
bon-like in shape ; long, narrow, and very thin. 
taenicide (te'ni-sid), w. [< L. tsenia, a tape- 
worm, + -cida, < csedere, kill.] A destroyer of 
tapeworms; a drug having the specific effect 
of killing tapeworms. Also tseniacide. Seetieni- 
Tadpoles. 
A, B, with gills; C. more advanced, a 
eye ; o, ear ; m, mouth ; , nasal sacs ; d 
>percular fold; kt>, ki, gills; ks. a single 
s, suck- 
fYvrrn wit ri yimrt branchial aperture; *, horuyja 
I IU, WIT. I ,- ers . y< rudiment of hind limb. 
Development of Trenia (A to F diagrammatic). 
A, young taenia in scolex stage. B, same, with enlarged receptacu- 
lum scolecis, by inversion of which the young taenia is mvaginated as 
at C, when it is a cystkercus of one head (hydatid or bladder-wonn). 
D. state called ccenure. E, hypothetical stage cf echinococcus, in 
which taema-heads are developed only on the inner surface of the 
primary cyst, and which represents an echinococcifer. F, echino- 
coccus with secondary cysts. G, an embryo ta;nia. H, Uenia-head 
or scolex of Echinococms vtterinontm, a stage of Tmnia echino- 
coccus ; a, hooks; A, suckers; r, cilia in water-vessels; (/.refractive 
particles. 
(a) A tapeworm. (b) [cap.] [NL.] The lead- 
ing genus of tapeworms, of the family Tseniidse, 
formerly very comprehensive, now restricted 
to species like T. soliwm, the common tape of 
man. Also Cijstotspnia. See tapetvornt Tanise 
Turpentine is a powerful tteniacide, but the use of it is 
liable to cause headache. Medical Newt, MIX. 313. 
taenidium (te-uid'i-um), n.; pi. txnidia (-&). 
[NL., dim. of L. tsenia, a band, ribbon : see 
teenia.] One of the chitinous fillets or bands 
which form either a part or the whole of the 
spiral thread surrounding the tracheae of in- 
sects. This spiral thread is not continuous, rarely mak- 
ing more than two or three spiral turns, and sometimes 
forms a single ring or a short band. A. S. Packard. 
tsniform (te'ni-form), a. [< L. txnia, a fillet, 
+ forma, form.] Ribbon-like ; having the form 
of a tape ; attenuate or teenioid. 
Conjoined in filiform or tseniform fascia. 
H. C. Wood, Fresh- Water Algse, p. 101. 
taenifuge (te'ni-fuj), w. [< NL. tsenia, a tape- 
worm, + fuf/are, drive away.] A substance 
used to expel tapeworms from the body ; a ver- 
mifuge employed as a remedy for tapeworms, 
as pumpkin-seeds or cusso. Also tseniafuae. 
See tsenicide. 
Kamala is an efficient teentfuge. Encyc. Brit., XIII. 831. 
Tseniidae (te-ni'i-de), n. pi. [NL., < Teenia + 
-idee.] A restricted family of cestoid worms, 
of which the genus Tsenia is the type. The spe- 
cies are rather numerous, and of several genera. See 
tapeworm (with cut), and cuts under cestoid and tsenia. 
tseniiform (te'ni-i-form), n. [< L. tsenia, a rib- 
bon, + forma, form.] Same as txniform; spe- 
cifically, of or pertaining to the Tseniiformes ; 
trachypteroid. 
Taeniiformes (te-'ni-i-for'mez), n. pi. [NL.: 
see tseniiform, taeniform.] A division of acan- 
thopterygian fishes, corresponding to the fam- 
ily Trachyptcridse. See Tseniosomi. 
Tfeniobranchia (te^ni-o-brang'ki-a), w. pi. 
[NL., < Gr. ratvia, a band, + /3pa7^(a,'gills.] A 
division of ascidians, containingthe salps: dis- 
tinguished from Saccobranchia. See Salpidse. 
taeniobranchiate (te"ni-o-brang'ki-at), . [< 
Gr. raivia, a band, ribbon, + fipayxio-, gills.] 
Having tseniate gills ; of or pertaining to the 
Tfeniobranchi/i. 
Taeniocampa (te // ni-o-kam'pa), . [NL. 
(Guen4e, 1839), < raivla, a band. 4- K&iim/, a cat- 
erpillar.] A notable genus of noetuid moths. 
of the family Or&OSiiaB. The body is stout; the 
wings are moderately broad, straight in front, more or 
less angular at the tips,and slightly or moderately oblique 
along the outer border ; and the male antennte are scarce- 
ly pectinate. It is represented in all parts of the world. 
