4. (Geom.) A curve of third order, having three infinite branches in
one direction and a fourth infinite branch in the opposite direction.
Trident bat (Zoöl.), an Asiatic rhinolophid bat (Triænops Persicus),
having the nose membrane in the shape of a trident.
Tri"dent, a. [L. tridens.] Having three teeth or prongs; tridentate.
{ Tri*den"tate (?), Tri*den"ta*ted (?), } a. [NL. tridentatus. See
Trident.] Having three teeth; three-toothed. Lee.
Tri"dent*ed (?), a. Having three prongs; trident; tridentate; as, a
tridented mace. [R.] Quarles.
Tri`dent*if"er*ous (?), a. [L. tridentifer; tridens trident + ferre to
bear.] Bearing a trident.
Tri*den"tine (?), a. [From L. Tridentum Trent.] Of or pertaining to
Trent, or the general church council held in that city.
Tri*di`a*pa"son (?), n. [Pref. tri- + diaposon.] (Anc. Mus.) A triple
octave, or twenty- second. Busby.
Tri`di*men"sion*al (?), a. [Pref. tri- + dimensional.] (Chem.) Having
three dimensions; extended in three different directions.
Tri"ding (?), n. A riding. See Trithing.
Trid"u*an (?), a. [L. triduanus, fr. triduum space of three days; tri-
+ dies day.] Lasting three lays; also, happening every third day. [R.]
Blount.
Trid"y*mite (?), n. [Gr. &?; threefold. So called in allusion to the
supposed threefold nature of the twin crystals.] (Min.) Pure silica,
like quartz, but crystallizing in hexagonal tables. It is found in
trachyte and similar rocks.
Tried (?), imp. & p. p. of Try. Also adj. Proved; tested; faithful;
trustworthy; as, a tried friend.
Tri*e"dral (?), a. See Trihedral.
Tri*en"ni*al (?), a. [L. triennium the space of three years; tri- (see
Tri-) + annus year. See Annual.] 1. Continuing three years; as,
triennial parliaments; a triennial reign. Howell.
2. Happening, coming about, or appearing once in every three years; as,
triennial elections; a triennial catalogue; a triennial visitation. T.
Warton.
Tri*en"ni*al, n. Something which takes place or appears once in three
years.
Tri*en"ni*al*ly, adv. Once in three years.
||Tri"ens (?), n. [L., from tres, tria, three.] (Rom. Antiq.) A Roman
||copper coin, equal to one third of the as. See 3d As, 2.
||
Tri"er (?), n. [From Try.] 1. One who tries; one who makes experiments;
one who examines anything by a test or standard. Boyle.