tripudiate 
< tri/iiiiltiini, 11 measured stamping, n solemn 
religious dance; formation ilniilitful to the 
Unmans themselves; prnb. < trm (tri-}, tliri'i-, 
+ poll- (= (Jr. T<!-), u form nf tlir root of pen 
(/mf-), foot. According In Cicero, contracted 
IIMIM "li-rri/iiidiiim t'ur t< nt/Kimim. strikingtho 
earth, Own. earth. + /iiirin . strike: sooyjdiv. ] 
To dance. 
A sweet chorus at wcll-tinii>il iitl'ci-li , mill ii spirit 
tripuiiialituf for Joy. Culwrtfttl, 'I'll'- St-hisim-. t I.atham.) 
tripudiation (tn-pu-di-a'shon). . |< /////</< 
iifr + -ma.] Tlie net of dancing, t'lirljili'. 
tripudium (trf-pft'di-tan), . |L., n leaping 
OT dunoing: see In/iin/iiili'.] In Hum. until/.: 
(a) A solemn religious dance, (b) A kind of 
divination practised by the augurs from inter- 
pretation of the actions of birds when fed, in 
later times always of domestic chickens, which 
were kept illi |is fur t he purpose. IfthofawlK 
ate greedily, the omen was good ; if they refused 
their food, the prognostic was very bad. 
tripupillate (tri-pu'pi-lat), a. [< L. trm (In-), 
three. + />i<iiilla, pupil.] In riitnnt., having 
three central spots or pupils close together: 
noting an ocollated spot. 
Tripylaea (trip-i-le'S), n. pi. [NL., < Gr. rptic, 
(T/H-), three, + -i/i/, a gate.] An order of 
siliooskeletal Ilmliolaria, whose central capsule 
has a single nucleus, a double membrane, and 
more than one perforate area, the polar aper- 
ture being supplemented by one or more other 
openings. The skeleton is diversiform, often composed 
of tubes, and the capsule is pigmented with pha>odlum. 
Hurting, 1879. Also called Phjradaria. 
tripylaean (trip-i-16'an). a. and n. [< Trt/iykra 
4- -.] I. <i. Of or pertaining to the Tripylxn, 
or having their characters ; phteodarian, as a 
radiolarian. 
II. n, A member of the Tripultea; a phteo- 
darian. 
tripyramid (tri-pir'a-mid), . [< Or. rpiic(Tpi-), 
three, 4- ira/iafiif, pyramid.] A kind of spar 
composed of three-sided pyramids. 
triquetra 1 (tri-kwet'rii), . [NL., fern, of L. 
triqiietriin, three-cornered: see triquetrous.] A 
symmetrical interlaced ornament, of three arcs 
or lobes, of frequent occurrence in early north- 
ern art in Europe. 
triquetra' 2 , . Plural of triquctrum. 
triquetral (tri-kwet'ral), a. [< triquetr-ous + 
-a/.] Same us trii/itctrous. 
triquetric (tri-kwet'rik), n. Pertaining to the 
triquetra. 
triquetrous (tri-kwet'rus), a. [< L. triqttetrwt, 
three-cornered, triangular, < tres(tri-), tnree, + 
-guetruit, prob. a mere formative. Cf. trinkets.'] 
Three-sided ; triangular ; having three plane 
or concave sides, (a) In aiuit., noting the triangular 
Wormian bones of the skull. See triquetrvm. (b) In en- 
torn., noting a part or organ whose cross-section is an 
equilateral triangle, (f) In tint., having three acute an- 
gles with concave faces, as the stein of many plants; 
three-edged ; three-cornered. 
triquetrously (tri-kwet'rus-li), adv. In a tri- 
quetrous form ; triangularly. Star month. 
triquetrum (tri-kwet'rum), . ; pi. triquetrn 
(-ra). [NL.: see triijiti'trnta.] In anat., one of 
the irregular, often triangular, Wormian bones 
found in the lambdoid suture of the skull : more 
fully called os triquetrum, and generally in the 
plural ossa triqii<-t>-ii. 
triquinate (tri-kwi'nat), a. [< L. tres (tri-), 
three,+ quini, five each, + -atel (seequinatf*).] 
In hot., divided first into three parts or lobes 
and then into live. 
triradial (tri-ra'di-al), . [< L. ires (tri-), 
three, + radius, ray: see radial.] Same as tri- 
radiate. 
tliradially (tri-ra'di-al-i), adr. With three rays. 
triradiate (tri-ra'di-at), a. and . [< L. trcs 
(tri-), three, + radiatus, rayed: see radiate.] 
1. a. 1. Radiating in three directions ; sending 
off three rays or processes ; trifurcate. 
The well-known triradiate mark of a leech-liitc. 
Huxley, Anat. Invert., p. 189. 
2. In antit., specifically noting one of the lat- 
eral fissures of the brain. 3. In sponges, noting 
a type of spicule. See II. -Triradiate sulcns. Sec 
fltlcux. 
II. n. A triradiate sponge-spicule. 
The chief modification of the triradiate spicule is due 
to an elongation of one ray, distinguished as apical, the 
shorter inured rays being tunned basal, mill thu whole 
spicule a sagittal Iriradialt. Knetif. ISril ., XXII. 417. 
trlradiated (tri-ra'di-a-ted), <i. f< trinidinte 
+ -eit-.] Same us triradinte. 
triradiately (tri-ra'di-at-li), adr. In a triradi- 
ate manner; in throe radiating lines. 
(1189 
trirectangular (tri-rok-tang'gu-lar). . [< I,. 
tHt (tn-), three, + rirtiix. right. + <ini/iilnx. 
angle i-.ee ri'rl/nii/Hlilr). \ Having three right 
angles, a- certain -phorical triangles. 
trireme (tri'rom). . [ = F. /nrmir = Sp. I'g. 
It. triri'ini; < I,. InriHii*, a vessel with three 
banks of oars, prop. adj. (sc. i/iiri.. vessel), 
having three banks of oars, < tri* (tri-), three. 
+ minis, oar.] A vessel with three bench'--, 
ranks, or tiers of oars on a side: a tv)>o of an- 
cient (ircek war-ship of groat efficiency, copied 
by the Unmans and other peoples. The trireme 
was provided with one, two, or three inasU. which were 
unitepped when the vessel was not under ull. At lint 
naval nattles were simply contents of weight or force, and 
the victory fell tu the trip un- w liirh hud the greatest niini 
Diagram ami CroK-sectton of an Athenian Trireme, u restored 1 18831 
by M. Raoul Lenialtre. (From " Revue Archcoloffique.") 
her of fighting men, or the best-disciplined, on hoard, nau- 
tical manoeuvers being scarcely attempted. The Athenians, 
however, In the fifth century B. c., introduced very skilful 
naval tactics, and made hand-to-hand fighting by the ma- 
rines subordinate to the attempt to disable the enemy's 
ship by ramming her amidships, or by crushing her banks 
of oars. The perfected trireme resembled more closely In 
theory and tactics the modem steam-ram than any form 
of ship that has intervened. It was long, narrow, and 
swift; the modern steam-engine was represented by the 
mechanical rowing of about 170 men, carefully trained, and 
under perfect command ; and it was entirely Independent 
of its sails, which were not hoisted unless, while cruising, 
the wind chanced to be favorable. 
Thticydldes writeth that Aminocles the Corinthian built 
the flrst trireme with three rowes of ores to a side. 
Holland, tr. of Pliny, vll. 56. 
trirhomboidal (tri-rom-boi'dl), a. [< tri- + 
rhomboidnl.] Having the form of three rhombs. 
trisacramentarian (tri-sak'ra-men-ta'ri-an), n. 
[< li.tres (tri-), three, + gacramrntum, sacrament 
(see aofratnent), + -arifin.] A name given to 
those who maintain that three, and only three, 
sacraments are necessary to salvation name- 
ly, baptism, the eucharist, and absolution. 
Trisagion (tri-sa'gi-on), n. [< Gr. rpiaaytof, 
thrice holy, < rpif (= L. ter for "terx), thrice (< 
rpfif (rpi-), three), + aj<or, holy, sacred.] A 
hymn of the early and Oriental churches, ap- 
parently of Jewish origin, consisting of the 
words " Holy God, holy (and) mighty, holy (and) 
immortal, have mercy upon us." It U tang In the 
Greek Church at the Little Entrance (see entrain**, n.\ 
and occurs frequently in the Greek daily office. It is also 
found in almost all Eastern liturgies. In the West the 
Trisagion was used in the Galilean liturgy and In the 
Sarum prime. It Is still sung in Greek and Latin at the 
Reproaches on Qixtd Friday. The anthem " Yet, O Lord 
God most holy," in the Anglican burial office, represents a 
form of the Trisagion. The name TVtM^ion is often in* 
correctly applied to the Sanctus (Teraanctus). 
triscele, M. See trislcrle. 
triset, *' and n. An obsolete spelling of tricri. 
trisect (tri-sekf), r. t. [< L. trcg (tri-), three, 
+ necttis, pp. of nccarf, cut: see secant. Cf. 
bisect.] To cut or divide into three parts, es- 
pecially into three equal parts. 
trisectibn (tri-sek'shon), n. [= F. IrUtFrlimi 
= Sp. triseccion = Pjg.trisecfflo = It. trisezione; 
as trisect + -ion. Cf. section.] The division 
of a thing into three parts; particularly, in 
i/i'inii., the division of a straight line or an an- 
gle into three equal parts. The trisect ion of an 
angle, geometrically, was a problem of great celebrity 
among the Greek mathematicians. It has been proved 
to be impossible with the rule and compass alone (though 
it is of course easy to trisect certain angles), but can 
be performed with any one of numerous machines which 
have been invented for the purpose. See cut under 
linkaije. 
trisectory (tri-sek'to-ri), a. [< triert(ion) + 
-ori/.] Conducive to the trisection of the angle. 
as certain curves of the third order. 
triseme (tri'sem), <i. and ii. [< Gr. rnris (rpi-), 
three, + aijfia, sign : see lri*< tiu<\] I. n. Con- 
sisting of three semeia ; trisemic. 
II. . A trisemic time or syllable. 
trisemic (tri-se'mik). . [< L\J. fri'xeiMtw, < Gr. 
Tpiat/ftof, having three times or more, < rpeif 
trispermum 
(rpi-). three. + r.i : un. sign. _'ti. mora.] 
In inn-, jnii.i., coiitiiiiiiii^' or equal to thr> 
mcia nr norii': a-. OM^' one half 
Imigi-r than the usual Im ftttt foot. 
The tri-einic feet tribrach, trochee, iambus) 
arc all 'liplaM'-. 
trisepalous (tri-scp'a-lus), . [< I,. Irr* (Iri-), 
three, + Nl, . Kl/iilllllH, sepal. + -HUM.] Ill /nil., 
having three sepals. See cut under i-nh/j-. 
triseptate Itn-sep'tat), <i. [< I/. In* i/i-i-\ 
tune, + .vi /limn, ]iarlitioii. 4- -<if<'.] In Imi. 
and .mil., having three septa or partitions. 
triserial(!ii-se'ri-al).(i. [' I.. /,..<</,,- three, 
+ mriis. series, 4- -!/. | In ..nul.. mini., and ///.. 
set in threrrows; di>]isod in tl. : tris- 
ticlioiis: irifarinus. AUo // /. mitt . 
triserially (tri-se'ri-al-i), d'/r. Iii three t- 
so as to be tri-i-rial. 
triseriatedri-se'ri-at >.n. [< 1.. n-> . i . //-i-i, three. 
-i-ries. + -at- '.] Same as trixrrinl. 
trlseriatim (tri-Ke-ri-a'tim), </r. [< I,. 
(tri-), three. + m-rieg, series, + -atim an in eri- 
Htim. ] In throo ranks or rows; so as to make 
throe series; triserially. 
trisetose ( t n-so'tos), a. [< L. tren ( tri-), three, 
4- XI-IH, a bristle: see netote.] In entom., bear- 
ing three seta- or bristles. 
Trisetum(tri-se'tum), . [NL. (Per80on,1805). 
< L. tri'K (tri-), three, + urtn. .,</, u bristle.) 
A genus of grasses, of t ho tri bo . I rrnra and sub- 
trilie KIIIIII IH:I. it In characUriied by a spike-like 
or loosely branched panicle ; nplkelcts with two or more 
bisexual flowers, their axis produced beyond them ; and 
a thin keeled flowering glume bearing a dorul awn and 
two terminal teeth. There are nearly SO species, widely 
scattered through temperate And mountain regions. They 
are chiefly perennial tufted grann with flat leave* and 
hlnlng splkelcta. Two species, T. nitopfcaOnn and T. pa- 
liatre, IK-CUT in the northeastern Cnlted Statea. T. err- 
iiuiim, of California and Oregon, Is aald to afford pasturage. 
trisinuatfl (tri-sin'O-at), n. [< L. trex (tri-), 
three, 4- ximi.v, 11 fold : see sinuate.] Inentom., 
having three sinuses: noting a margin when it 
has three inward curves meeting in outward 
curves. 
triskele (tris'kel), n. [Also trixceli ; < (Jr. rpia- 
Kf'fK, three-legged, < r^ifir (TIM-), three, + <TK//or, 
leg.] A figure formed of three lines radiating 
from a common point or small circle, or a modi- 
fication of this in which each radiating arm has 
the form of a hook so as to give the appearance 
of being in revolution, or of a bent human leg. 
Also called three-armed crow. Compare min- 
imake, fylfot. 
trismus (tris'mus), . [NL., < Gr. rptefi^ a 
creaking or croaking, < rpifnr, squeak, grind 
or gnash (the teeth).] A tonic spasm of the 
muscles of mastication, causing closure of the 
lower jaw, occurring as a manifestation of teta- 
nus, either alone or in conjunction with other 
tonic muscular spasms ; lockjaw Trtamusiia- 
centium, "r trismus neonatorum, a fnrm of tetanus 
occurring In new-born Infants; infantile tetanus. The 
muscles of the neck and Jaw are flrst affected, but usually 
general tetanic spasms soon follow. The disease occur* 
with special frequency In the negro race and In tropical 
countries, though severe epidemics have also prevailed In 
the extreme north. 
trisoctahedral (tris-ok-ta-he'dral). n. [< tris- 
octalirdrott + -al.] Bounded by twenty-four 
equal faces; pertaining to a trisoctahedron, or 
having its form. 
trisoctahedron (tris-ok-ta-he'dron), . [< (Jr. 
rpic, thrice, 4- E. iirtnlicilroii.] 
Ill crystal., a solid bounded 
by twenty-four equal faces, 
three corresponding to each 
face of an octahedron. The 
trigonal trisoctahedron has each 
face an isosceles triangle, and In the 
tetragonal trisoctahedron, or trape. 
tohedron, each face Is a qundrilut 
end. See also cut under traprmltr- 
dnn _ Tri,pITrl,oct.b. 
trispast, trispaston (tri'- 
spast, tri-spas ton), w. [< L. trix/ia/iton, a ma- 
chine with three pulleys, v Gr. rpiffTooror, drawn 
threefold (Tpitnraarov 6p)avm; a triple pulley, 
rpiovatnov, a surgical instrument), < rpeif (rpi-), 
three, 4- 'trxatrruf, verbal adj. of <nrdr. draw: see 
.i/Hutm.] A machine with three pulleys acting 
in connection with ea<h other, for raising great 
weights. Brandr and Cm. 
trispennOUS (tri-sper'mus). a. [< Gr. rpeif 
(rpt-), three. + n-iinui. seed.] In hot., three- 
seeded: containing three seeds: as, a trisper- 
IHIIII.-- capsule. 
trispennum (tri-sper'mum), M. [NL.,< Or. rprir 
(rp/-), three, 4- airip/ia, seed.] A poultice, for- 
merly in vogue, made of crushed cumin-, bay-, 
and smallage-scods. 
