trlgloid 
trigloid (trig'loid), n. uiul H. [< Trillin + -nl. \ 
I. n. lieseiuliliiig or related tci tin- ^iiniiird'-: 
belonging to thr Trii/liil,T in a broad M-H^I-; <i( 
or pertaining to the Tri'/lmilin. /'/<. r. N. \nt. 
MIIWKIII. XI. 588. 
II. . A gurnard or related lixli : any mem- 
ber of the Trigloiilcii. 
Trigloidea(trig-loi'de-!i). . ///. [XL., < Trigln 
+ Gr. fHof , form.] A superf amily of acanthop- 
terygian fishes, represented hy th Triijliilir and 
related fitinilies. The ix>Bt-tuiii|>oral forms an integral 
part of the cranium; tin- pmtarotatvpon] is conti'-'inii:- 
to the proHcapula ; and thu third miliorhital In greatly rn- 
largcd and covers the cheek, articulating l>rlilnd with the 
anterior wall of the preopttrculuin. 
triglot (tri'glot), u. [< Ur. r/ifif (rpi-), three, + 
}^Maaa, j'/Uirra, tongue.] ( 'oiitaimng, composed 
in, or relating to three languages: as, a trinlut 
ilictioii:ir\ . 
trigly (trfg'li). adf. [< <ri</i + -ly*.] In a trig 
manner; neatly; trimly; finely. [Provincial 
or colloq.] 
80 he that hathe a conscicns cleere 
May stand to hys takkcll tryHye. 
Klderton, Lenten tuffe(1670). (llallimll.) 
O busk yir locks tritjly, an' kilt up y ir coatlea. 
Tarra, Poems, p. 124. (Jamieton.) 
triglyceride (tri-glis'e-rid or -rid), . [< Gr. 
rprif (rp/-), three, + E. glyecr-in + -ide 1 .] Ill 
chem., a substitution product formed by the re- 
placement of three hydrogen atoms in glyeerol 
by acid radicals. The triglycerides formed by stearic, 
palmitic, oleic, and butyric acids make up the larger part 
of most animal and vegetable fate. 
triglyph (tri'glif), n. [= F. trii/lyphc, < L. tri- 
n/itiilnts, < Gr. rpiy/lu^of, a three-grooved block 
in the Doric frieze, prop, adj., three-grooved, < 
rpeif (rpi-), three, + yAtyeiv, carve, groove, y?.t>#, 
a cutting, a channel: see glyph.] In arch., a 
structural member in the frieze of the Doric 
order, repeated at equal intervals, usually over 
every column and over the middle of every in- 
tercolumniation. The typical Greek triglyph IB a mas- 
A Triglyph of the Parthenon, showing the (rroove in one side of the 
block into which the metope was slid. 
slve block incised with two entire vertical grooves cut 
to a right angle, called ylyphs, framed between three fil- 
lets, and with a semi-groove at each side. The block is 
grooved on both sides to receive the adjoining metopes, 
which are thin slabs slid into their places from above. The 
triglyphs represent the ends of the ceiling-beams of the 
primitive wooden construction. In Greek use the ex- 
terior triglyphs of a range are always slightly displaced, 
so as to occupy the angles of the frieze Instead of coming, 
like the others, over the centers of the columns ; in Ro- 
man and affiliated architectures this refinement does not 
occur ; and iu Roman and even some of the later Greek ex- 
amples the triglyphs are merely carved In relief in the 
face of the frieze blocks, instead of being, as properly, In- 
dependent blocks. See also cute under entablature and 
inonotri'jlyph. 
All round between the Iriglypla in the frieze there are 
most exquisite alt-reliefs of combat* with centaurs, lions, 
and many on horses. 
Pococlce, Description of the East, II. II. 188. 
triglyphal (tri'glif-al), a. [< trh,lypl, + -al.] 
Same as Mglyphic. Amor. Jour. Archeeol.,\l.o4. 
triglyphiC (tri-glif ik), a. [< triglyph + -ir.] 
1. Consisting of or pertaining to triglyphs. 
2. Containing three sets of characters or sculp- 
tures. 
triglyphical (tri-glif'i-kal), . [< triglyphic + 
-al.] Same as triglyphic. 
trigness (trig'nes), n. The state of being trig 
or trim ; neatness. [Provincial or colloq.] 
The lassies who had been at Nanse Bank's school 
were always well spoken of ... for the trignett of their 
houses, when they were afterwards married. 
Gait, Annuls of the Parish, p. 29. 
trigon 1 (tri'gon), w. [< F. trigone = Sp. tri- 
i/inio. also trigon = Pg. It. trigono, < L. tri<i<>- 
iniiii. also Irii/diiiiim, < Or. lyw'joiw, a triangle,* 
musical instrument so called, neut. of rp/juvoc, 
three-cornered, triangled, < rpe/f (iy"-)> three, + 
jww'o, angle.] 1. A triangle. 
B477 
As when the cranes direct their flight on IIIL-II. 
Tn rut lln-ir w;i\, tln-y in :i tii'/nn Hit-; 
\Miii-h pninN-cl tik'ure may with ease dlulde 
Opposing blasts, through which they swiftly glide. 
Sir .1. litaument, Bosworth Field. 
2. In nttlrnl.: (n) The junct ion of three signs, 
the zodiac being divided into four trigon*: 
the iciib-ry trigon, which includes Cancer, Scor- 
pio, and Pisces; the earthly trigon, Taurus, 
Virgo, and Capricornus; the airy trigon, Gem- 
ini. Libra, and Aquarius ; and the fiery trigon, 
Aries, Leo, and Sagittarius. 
Look I in the almanac) whether the fiery Triyon, his man, 
benotlUplngto his master's old tables, his note-lux. k, his 
counsel-keeper. Skat., 2 Hen. IV., il. 4. 288. 
(b) Trine: an aspect of two planets distant 120 
degrees from each other. 3. In antiq. : (a) A 
kind of triangular lyre or harp. Also called 
Irii/onon. (b) A game at ball played by three 
persons standing so as to be at the angles of a 
triangle. 4. An instrument of a triangular 
form, used in dialing. Kersey, 1708. 15. In 
conch., a shell of the genus Trigonia. 
trigon 2 t (trig'on), n. [Also trigen; appar. for 
'triggin, a dial, form of "trigging, < trig 3 + 
-t'Hj/X] A trig ; a skid. 
And stoppeth the wheel with a Trigen (Sufflamlne) In a 
steep descent. lloole, tr. of The Visible World, IxxxvL 
Trigon, a Pole to stop the Wheel of a Cart, where It 
goes too fast down a steep Place. ItaOry, 1781. 
trigonal (trig'o-nal), a. and n. [< trigor> 1 + 
-at.] I. a. 1. 'Pertaining to a trigon ; having 
the form of a trigon ; triangular. 2. In entom., 
triangular in cross-section ; having three long 
edges ; trihedral ; prismatic : as, trigonal anten- 
nae; trigonal joints. 3. In hot., , same as trigo- 
nous. 4. In anat., noting a triangular space 
at the base of the bladder. See trigonum (a). 
Trigonal coordinate, one of a set of three coordi- 
nates of a (mint In a plane, which are related to trilinear 
coordinates as follows. Let x,, + , = yn/in, y-M = fa/x, 
*<-, = *;., and let *, y,, z., be trilinear coordinates. 
Then *, tf, in are called trigonal coordinates of the nth 
class. Trigonal coordinates are subject to the equation 
XH'iftZn -\, which does not vary with the triangle of refer- 
ence. They are valuable for studying higher plane curves. 
Thus, a linear equation In trigonal coordinates of the first 
class represents a cubic. They were Invented by 8. Lev! 
in 1876, and must not he confounded with Walton's tri- 
gonic coordinates. Trigonal residue. See retidue. 
Trigonal trapezohedron. See tetartohedriim. Trig- 
onal trlsoctanedron. See tritoctahednn. 
II. n. In anat.. the triangular space at the 
base of the bladder ; the trigonum. 
Trigonalidae (trig-6-nal'i-de), n. pi. [NL., < 
Trigonalys + -idee.] A family of parasitic hy- 
menopters, having the single genus Trigonalys. 
trigonally (trig'o-nal-i), adv. Triangularly. 
Trigonalys (tri-goii'a-lis), w. [NL. (West- 
wood, 1835), < Gr. Tpifuvof, three-cornered, + 
(irreg.) oXuc, a threshing-floor, a disk : see halo.] 
An anomalous genus of hymeuopterous insects, 
formerly placed in the family Etaniidte, now 
considered as forming a family by itself. The 
abdomen Is attached to the extremity of the thorax, the 
fore wings have two recurrent nervures, and the first 
submarginal and first discoidal cells are distinct Three 
European and four North American species are known. 
trigonate (trig'o-nat), a. [< trigon* + -ate*.] 
In entom., same as trigonal.2. 
trigone (tri'gon), . [= F. trigone, < NL. tri- 
gonum, < Gr. rplfuvof, three-cornered.] The tri- 
gonum of the bladder. See trigonum (a). 
Trigonella (trig-o-nel'a), n. [NL. (Linnwus, 
1737), so called with re'f . to the three-cornered 
appearance of the flower; 
< Gr. Tpiyuvof, three-cor- 
nered (see trigon 1 ), + dim. 
-etta.] A genus of legumi- 
nous plants, of the tribe 
Trifolic ee, characterized by 
obtuse keel-petals, nu- 
merous ovules, and a pod 
which is straight, falcate, 
or arcuate, but not spiral. 
There are about 60 species, na- 
tives of Europe, Asia, and North 
Africa, with a few iu South Afri- 
ca, and one, T. luaeiaima. In 
the interior of Australia. They 
are usually strong-smelling 
herbs, having pinnately trifoli- 
ate leaves with adnate stipules. 
Most of the species bear yellow 
or white flowers In a head or 
short raceme. The pod is lin- 
ear, its veins being reticulated 
In the section Bucerat; In Fai- 
catula It is broad and com- 
pressed, and Its veins are 
straight. In a few similar spe- 
cies, the section Pocodna, the 
pod bears winged or fringed su- 
tures. 1 n three smaller sections 
with beaked pods, the flowers iu 
ITnciittUa are usually pendulous. ,t. a fruit. 
In P. 
trigonocerous 
solitary, in (rraintimfarjiti* blue. Sev- 
ter of being trigo- 
(NL. (Bruguiere, 
A Trigon <,Trift*ia mlmlm\. 
ill r JViuis>*yr4PCW*n MMIMU j , 111 ' 
.nil ..f the species, especially T. Punum^rmetan, an 
known a/tmvnet (which see* T. acrulea Is the Swiss 
in. hint. T. anMafodiaidti Is the bird .-loot fenugreek, 
:. r. .i.li.li-nnwered prostrate species growing on British 
heaths. T. rm/ArXvneAu> Is the blrd's-blll fenugreek, a 
yellow Russian species with fleshy leaves, spiny pe- 
duncles, and pods with a recurving beak. T. luamnfma 
has been found valuable for pasturage In Australia. 
trigonellite (trig-o-nel'It), . [As Trigonttln + 
-if--'.] A fossil shelly substance. See aptyckvt. 
trigoneutic(tri-go-nu'tik),a. [< Gr. rpeli;(rpt-), 
three, + -.iii'iicii/, beget.] In entom., triple- 
brooded ; having three broods in a single year. 
Si-e In: nlliin . 
trigoneutism(tri-go-nu'ti7.m),. | 
+ -turn.] The Htnte orcha 
ncnt i.- or triple-brooded. 
Trigonia (tri-go'ni-ft), . 
1791), < Gr. rpiyuvof, 
three-cornered: see 
j/ol.] 1. The typical 
genus of the family Tri- 
goniida. T. margari- 
tacea is the pearly tri- 
gon. See also cut under 
Triaoniidie. 2. [I. c.] A 
shell of the genus Tri- 
gonia or family Trigoni- 
idte; a trigon: also used 
attributively : as, the tri- 
gniiiii beds or grits Trt- 
gonla beds, a subdivision of 
the Coralllan division of the 
Jurassic, especially well de- 
veloped at Osmlngton near Weymouth, England. Tri- 
gonia grits, subdivisions of the Oolite In England. The 
T'pper and Lower Trigonia grits are subdivisions of the 
I'pper and Lower Ragstones, which are themselves divi- 
sions of the Inferior Oolite In Gloucestershire. 
Trigoniacea (tri-go-ni-a'se-a), n. pi. [NL., < 
Trigonia + -acea.] A superfamily of mtegri- 
palliate isomyarian bivalve mollusks, repre- 
sented by the family Trigoniida. 
trigoniacean (tri-go-ni-a'se-an), a. and n. I. 
a. Of or pertaining to the Trigoniacea. 
H. n. A member of the Trigoniacea. 
trigonic (tri-gon'ik), a. f < trigon^ + -ic.] Per- 
taining to a trigon or triangle Trigonic coor- 
dinate, one of a set of three coordinates determining 
the position of a point in a plane, these being the three 
angles subtended between three points of reference as 
seen from the point whose position Is In question : In- 
Tented by William Walton In 1868, and not to be con- 
founded with trilinear or with trigonal coordinates. 
Trigoniidae (trig-o-ui'i-de). n. pi. [NL., < Tri- 
gonia + -idm.] ' A family of dimyarian bi- 
valves. The mantle- 
margins are free and 
without siphons ; the 
hranchisB are ample and 
unequal ; the foot Is 
long and angulated be- 
hind ; the palpi are small 
and pointed ; the shell In 
equlvalve and nacreous 
within; the umbones are 
anti-median ; the liga- 
ment la externsl ; the 
cardinal teeth are diver- 
gent, and more or less 
transversely striated ; 
and the pall ial impression 
Is entire. It Is a group 
of mollusks whose living 
species are few and con- 
fined to the Australian seas, but which had an extensive 
range from the Trtassic to the Cretaceous epoch. The 
typical genus 1s Trigonia. Also Trigvniada, Trigonid*. 
See also cut under Trigonia. 
Trigonocarpus (trig'o-no-kar'pus), . [NL., 
< Gr. Tplyvvof, three-cornered, + Kapiroc, fruit.] 
The generic name given by Brongniart (1828) 
to certain fossil fruits, very abundant in the 
coal-measures of both the Old World and the 
New World, the botanical relations of which are 
Still uncertain. These fruits are ovoid in shape, with 
either three or six strongly marked ribs, which are more 
distinct toward the base, and sometimes disappear above ; 
at the apex Is a small round or triangular cavity. 
trigonocephalous (trig'o-no-sef'a-lus), a. [< 
Gr. rpiyuvof, three-cornered, + ne<pa)t/, head.] 
Having a flattened and somewhat triangular 
head, as a venomous serpent of the genus Tri- 
gonocephulux. 
Trigonocephalus (trig'o-no-sef'a-lus), H. [NL. 
(Oppel, 1811), < Gr. rpiyuvof, three-cornered, + 
KtjasJ!, head.] A genus of venomous serpents, 
of the family Crotalidr : used with various ap- 
plications. See Ancistrodon, Craspedoc<)i)i<i- 
lus, Toricophin, copperhead, ferule-lance, and 
trigonocerous (trig-6-nos'e-rus), a. [< Gr. rpi- 
juw>f, three-cornered, + nfpaf, horn.] Having 
horns with three angles, edges, or ridges that 
is, triangular in cross-section. 
Structure of Trigoniidm (TrtfOHia 
ftfttmata). 
a, a', adductors:/, foot ; hi, hinge- 
ligament ; It, labial tentacles or pal- 
pi : m, margin : a. mouth : /. pallia! 
line; t, f, dental sockets: f.cloaca. 
