Tricuspid, trī-kus′pid, adj. having three cusps or points: (anat.) denoting certain of the teeth, and the valve of the right ventricle of the heart.—adj. Tricus′pidate (bot.), three-pointed or ending in three points. [L. tricuspis, tricuspidis—tri, tris, thrice, cuspis, a point.]
Tricycle, trī′si-kl, n. a velocipede with three wheels.—v.i. to ride on such.—n. Trī′cyclist. [Gr. tri-, root of treis, three, kyklos, circle, wheel.]
Tridacna, trī-dak′na, n. a genus of bivalves, the giant clam, without the shell weighing 20 lb., with the shell so much even as 500 lb. [Gr. treis, three, daknein, to bite.]
Tridactylous, trī-dak′til-us, adj. having three toes or fingers.
Tride, trīd, adj. swift, fleet. [Fr.]
Trident, trī′dent, n. the three-pronged spear or sceptre of Neptune, god of the ocean: any three-toothed instrument.—adjs. Trī′dent, Trident′āte, Trī′dented, having three teeth or prongs. [Fr.,—L. tres, three, dens, dentis, tooth.]
Tridentine, trī-den′tin, adj. pertaining to the Council of Trent (1545-63), or to its decrees.—n. a Roman Catholic. [L. Tridentum, Trent.]
Tridigitate, trī-dij′i-tāt, adj. with three fingers or toes.
Tridimensional, trī-di-men′shun-al, adj. having three dimensions—length, breadth, thickness.
Triduum, trid′ū-um, n. a space of three days: a three days' service of prayer preparatory to a saint's day, &c.—adj. Trid′ūan, lasting three days. [L.]