tricuspidated 
tricuspidated (tn-kus'pi-'la-ted), ,/. [< //-,,- 
/liiliili + -nt-.\ Same as trirn.'i/iiitiili. 
(Iyer each cliMir is a lofty trictupidated arch. 
If. Hoiritt, Visits to Remarkable Placet, p. 402. 
tricycle (tri'si-kl), . [< F. //<//<'<, < <lr. rptic 
(r/-), three, 4- /.//./., cin-lc, wheel. ] A tlnv.-. 
wheelod vehicle. Specifically -(at) A three-wheeled 
coach. See the quotation. 
Tricyclrx. rhrintimiB liny WHH rendered memorable to 
I ! Parisians by the BturtinK of this new species of car- 
riage for public: accommodation. Tin; tricycle is a kind of 
coach, mounted on three wheels ; It IB drawn by two horses 
only. It moves very lightly, although tlu-re Is an appear- 
ance of weight about it. One wheel is placed exactly as 
the leading wheel of the steam coach ; it Is capable of con- 
taining twenty persons, whom It conveys distances of at 
least three miles for live sous curb. 
Annual Keyister for 182H ("rhnmicle," p. 18fi), quoted 
|ln N. and i)., 7th ser., .X. 148. 
(6) A modification of the velocipede or bicycle, having 
three wheels. The wheels are variously arranged, as two 
647:1 
teimlvrly united, with a large pedal opening in front c,f tin- 
iiinlMinrHof the- shc-ll; thcsiphonal orifices, sitiroundid b> 
a tliic:kc-nc-'l pallia] bonier, are at the lower margin erf the- 
"hell ; the- KillB an- double, narrow, the outer pair , 
posed of a single lamina, the Inner thick, with < 
tri diapason 
4. In /,''(///. unlit/., u tliree-prc.iitfecl sjii-ar n-.l 
by thi< retiaritis in glailiatoitel einnlials. 6. 
In 1/ttnn., a criiniHlal plane c-uliie curve hav- 
ing the line at infinity 
for one of the tangents 
at the node. It wan dm- 
covered and named by 
Tricycle. 
it, ilriviiiy-whec], ami b, steering-wheels all provided with solid 
rubber tires; t-. frame ; d, if, sprocket-wheels ; e, driving-chain work- 
ing on the sprocket-wheels; f, cranks and pedals; g, middle; It, 
cra<ltc-spring, upon which the saddle is mounted; I, handle-bars for 
steering. 
In front and one behind, or the reverse. Tricycles are 
made for one or two persons; In the latter case the riders 
sit either side by side or one before the other. Compare 
bicycle. 
tricycle (tri'si-kl), t\ i. ; pret. and pp. tricycled, 
ppr. tricycling. [< tricycle, w.] To ride on a 
tricycle. [Recent.] 
I have heard the uninitiated say that tricycling must be 
so easy, just like working the velocipedes of our chll 1- 
hood. 
J. and E. R. PenntU, Canterbury Pilgrimage on a Tricycle. 
tricycler (tri'si-kl6r), n. [< tricycle + -eri.~] 
One who rides on a tricycle. Harper's Mag., 
LXXVII. 491. [Recent.] 
tricyclist (tri'si-klist), n. [< tricycle + -is*.] 
A tricyclor. Bury and Hillier, Cycling, p. 200. 
Tridacna (tri-dak'na), n. [NL. (Da Costa, 1776), 
also erroneously Tridachia, Tridachna, Tridach- 
nes; < Gr. TpiSwtvos, eaten at three bites, < rptif 
(rpt-), three, 4- daicvetv, bite.] A genus of in- 
equilateral equi valve bivalve mollusks, forming 
the type of the family Tridacnidse. The margin 
Is deeply waved and indented, the opposite sides fitting 
Shell of one of the Giant Clams { Trvtatna sguampsa). 
into each other. T. gigas, the largest bivalve shell known, 
attains a length of 2 or 3 feet and a weight of 600 pounds 
or more. The animal may weigh 20 pounds or more. It 
is a native of the East Indian seas, and is edible. The 
great valves are used for various purposes, as for baptis- 
mal fonts as receptacles for holy water, and, It Is alleged, 
as babies bath-tuba. The substance of the shell Is ex- 
tremely hard, and calcification progresses until almost 
every trace of organic structure is obliterated. Pieces of 
the shell weighing 7 or 8 pounds are used by the natives 
of the Caroline Islands for axes. The other species of the 
genus, as T. aquamosa and T, crocea, are much smaller. 
Also called Petex. See also cut under Tridacnidx. 
Tridacnacea (tri-dak-ua'se-a), n. pi. [NL., < 
Tridarna + -firm.] A siiperfamily of bivalves, 
represented by the Tridacnidte alone. 
tridacnacean (tri-dak-na'se-an), a. and n. [< 
Tridaciiaci'a + -mi."] I. a. Of or pertaining to 
the Tridacnacea or Tridacnidx. 
II. H. A giant clam ; any member of the Tri- 
iltifnidir. 
Tridacnidae (tn-dak'ni-de), . {. [NL., < 2Vi- 
ilncna 4- -<</.] A family of bivalves, named 
from the genus Tridacna. The mantle-lobes are ex- 
. Anatomy of Trutatna tnte*. 
a. adductor muscle ; *, byitus ; i. valvular eicurrent orifice ; /. loot ; 
K, tills ; '. Inhalent orifice ; /, pallia! muscle ; m. mantle-margin ; o, 
orifice for foot aMpyMli /. pedal retractor muKle ; t. Ufihoiul bor- 
der ; /, l-i I -i. c I palpi. 
onsly grooved margin! ; the palpi are slender and pointed ; 
the foot is finger-like with a byssal groove ; the valves are 
regular and truncate In front, with an external ligament 
and blended subcentral muscular impression formed by 
the large adductor with the smaller pedal retractor mus- 
cle close behind it. It is a remarkable group, including 
the genera Tridacna and Hippomu (Tridacna ifi'jan being 
the largest member of the IfoUtuca), and Is the basis of 
the suborder Metarrhipta (which see). See also cuts un- 
der Hippopvt and Tridacna. 
tridacnoid (tri-duk'noid), a. and n. Same as 
MfbcMMMttM. 
tridactyl, tridactyle (tri-dak'til), a. [< F. tri- 
dactyle, < Gr. TptiaicnAof, three-fingered, three 
fingers long, < rpeif (rpt-), three, + oaicrtylof, fin- 
ger, toe.] 1. Having three digits, whether 
finders or toes; tridigitate. 2. Having three 
digital parts or processes. 
Also tridactylous. 
Tridactyla (tri-dak'ti-la), . [NL., < Gr. rpt- 
AdxTvfMf, three-fingered (three-toed): see tri- 
iiin-/i/l.\ In ornith., same as /'/(//'///>'. 
tridactylous (tri-dak'ti-lus), a. [< tridactyl + 
<HI*.\ Same as tridactyl. 
tridaily (tri-da'li), a. [< L. tres (tri-), three, 
+ E. daily.'] Made, done, or occurring thrice 
a day. Science, IX. 79. [Rare.] 
triddler (trid'lcdr), n. [Origin obscure.] The 
pectoral sandpiper, Tringa macultita: a gun- 
ners' name. G. Trumbull, 1808. [New Jersey.] 
tride (trid), a. [< F. tride, lively, cadenced; 
origin obscure.] In hunting, short and swift; 
fleet: as, a tride pace. 
Tride, a word signifying short and swift A (ride-pace 
is a going of short and swift motions. A horse is said to 
work tride upon volts when the times he makes with his 
haunches arc short and ready. Some apply the word only 
to the motion of the haunches. 
Otbaldittan, Sportsman's Diet., p. 636. 
tridens (tri'denz), n. [L.: see trident."] A 
three-toothed or three-bladed implement or 
weapon. 
In the latter example (a halberd] the axe-blade being 
balanced by a trident. J. Hewitt, Anc. Armour, II. 269. 
trident (tri'dent), n. [= F. trident = Sp. Pg. 
It. tridente, < L. triden( t-)i, three-toothed, three- 
pronged ; as a noun, a 
three-pronged spear, 
a trident as an at- 
tribute of Neptune; 
< tres (tri-), three, + 
den(t~)s = E. tooth: 
see tooth."] 1. Any 
instrument of the 
form of a fork with 
three prongs ; spe- 
cifically, a three- 
pronged fish-spear. 
2. A spear with 
three prongs, usually 
barb-pointed, form- 
ing a characteristic 
attribute of Poseidon 
(Neptune), the sea- 
god. See also cut 
under Poseidon. 
His nature is too noble for 
the world : 
He would not flatter Nep- 
tune for his trident, 
Or Jove tor's power to 
thunder. 
Shot., Cor., ill 1. 266. 
Trident Archaistic relief of Nep 
tune, in the Vatican. 
3. Hence, marine sovereignty; rule over the 
ocean or sea. 
To Worlds remote she wide extends her Reign, 
And wields the Trident of the stormy Main. 
, Birth of the Muse. 
tridentalt itn-.l.-i/tal), 
a. [< trulcttt + -a/.] 
Of or pertaining to a 
trident ; in the form 
of a trident; possessing 
or wielding a trident. 
Tin- wblte-moutb'd water 
now usurps the shore, 
And scorns the now r of her 
Manual guide. I 
Quarto, Emblems, L Z. Trid.ni, 5- 
Nor Juno leas endured, when erst the bold 
Bon of Amphitryon with tridental shaft 
Her bosom pierced. CWprr, Iliad, v. 458. 
tridentate (tri-den'tat), a. [= F. tridente, < 
NL. 'tridcntatits, having three teeth, < I. 
(tri-), three, 4- dentatim, toothed: see dentate, 
and cf. irnli nt.\ Having three teeth or tooth- 
like parts; tridentated; three-pronged. 
tridentated (tri-den'ta-ted), a. [< tridentate 
+ -erf*.] Same as tridentate. 
tridentedt (trf-den'ted), a. [< trident + -erf*.] 
Having three teeth or prongs. 
Neptune . . . 
Held his Indented mace. 
Qvarlet, Hist. Jonah, I 0. 
tridentiferous (tri-den-tif 'e-rus), a. [< L. tn- 
ilentifer, < tnden(t-)s, a tri'dent, 4- ferre = E. 
bear'.] Bearing a trident. Bailey, 1727. 
Tridentine (tri-den'tin), . and n. [< NL. Tri- 
dentinug, < ML. Tridentum, Trent (see def.).] 
1. a. 1. Pertaining to Trent, a city of Tyrol, 
or to the Council of Trent (1545-63): as, Tri- 
dentine decrees (that is, the decrees of the 
Council of Trent, the authoritative symbol of 
the Roman Catholic Church) ; Tridentine theol- 
ogy (that is, theology in accordance with those 
decrees, Roman Catholic theology). 
The King (Henry VIII.) remained a believer In Roman 
Catholic forms of doctrine ; but . . . those forms had not 
yet, by the Tridentine decrees, been hardened into their 
later inflexibility. 
Stvbbt, Medieval and Modern Hist, p 261. 
2. Conforming to the Council of Trent, or its 
decrees and doctrine. 
Her [Elizabeth's) explanation of her supreme governor- 
ship might have satisfied every one but the most Triden- 
tine papist, but she re-enacted the most stringent part of 
her father's act of supremacy. 
.SrnWw, Medieval and Modern Hist., p. 324. 
Tridentine catechism. See cateclam, 2. 
II. ". A Roman Catholic : a name implying 
that the present system of Roman Catholic 
doctrine and practice dates from the Council 
of Trent ( 154o). The creeds of the Roman Catholic 
Church are four In number the Apostles', the Nicene, 
the Athanasian, and the Creed of Pope Pius IV. The last 
named is also called the Frafeuian qfthe Tridentine Faith. 
It was formulated In 1564, and includes the Nicene Creed, 
a summary of the doctrines denned by the Council of Trent, 
a recognition of the Roman church as mother and teacher 
of all churches, and an oath of obedience to the Pope as 
successor of St. Peter and vicar of Christ. With the ad- 
dition of the doctrines of the immaculate conception (pro- 
imitated In 1854) and the papal Infallibility (defined In 
1870), this creed is that which must be accepted by con- 
verts to the Roman Church, except those from the Greek 
Church (for whom special forms are provided), and is in- 
cumbent on all Roman Catholic priesU and teachers. 
They called the council of Chalcedona "council of fools," 
and styled the Catholics fhalcedonians, just as Anglicans 
have styled Catholics of the present day Tridrntinti. 
Dublin Rev. (Imp. Diet.) 
Tridentipes (tri-den'ti-pez), n. [NL. (Hitch- 
cock, 1858), < L. tres (tri-), three, + dens (dent-) 
= E. timtlt, + pes = E. foot.] A genus of gi- 
gantic animals, formerly supposed to be birds, 
now believed to be dinosaunan reptiles, known 
by their footprints in the Triassic formation 
of the Connecticut valley. 
triderivative (tri-de-riv'a-tiv), n. [< Gr. r/wic 
(rp<-), three, 4- E. deriratire.] In cHem., a de- 
rivative in which there are three substituted 
atoms or radicals of the same kind: as, tri- 
chloracetic acid is a trideriratire of acetic acid. 
tridget, r. i. An obsolete form of triidin ' . 
tridiametral (tri-di-am'e-tral), a. [< Gr. rpeir 
(rpi-), three, + Ai&ftrrpof, diameter: see diame- 
tral.] Having three diameters. 
tridiapason (tri-di-a-pa'zon), . [< Gr. rpeif 
(rpi-), three, 4- Ataxaouv, diapason: see dia- 
pason.] In muxir, a triple octave, or twenty- 
second. 
