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A genus of very large marine bivalve shells found on the coral reefs of the Indian and Pacific Oceans. One species (T. gigas) often weighs four or five hundred pounds, and is sometimes used for baptismal fonts. Called also paw shell, and fountain shell.

Having three fingers or toes, or composed of three movable parts attached to a common base.

Tridactyl.

The jacksnipe. [Local, U.S.]

Short and ready; fleet; as, a tride pace; -- a term used by sportsmen. Bailey.

A hydrocarbon, C13H28, of the methane series, which is a probable ingredient both of crude petroleum and of kerosene, and is produced artificially as a light colorless liquid.

Of, pertaining to, or designating, that acid of the fatty acids heterologous with tridecane. It is a white crystalline substance.

A hydrocarbon, C13H26, of the ethylene series, corresponding to tridecane, and obtained from Burmah petroleum as a light colorless liquid; -- called also tridecylene, and tridecene.

finite branches in the 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.

Having three teeth; three-toothed. Lee.

Having three prongs; trident; tridentate; as, a tridented mace. [R.] Quarles.

Bearing a trident.

Of or pertaining to Trent, or the general church council held in that city.

A triple octave, or twenty-second. Busby.

Having three dimensions; extended in three different directions.

A riding. See Trithing.

Lasting three lays; also, happening every third day. [R.] Blount.

Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

A glyceride formed by the replacement of three hydrogen atoms in glycerin by acid radicals.

A hybrid whose parents differ by three pairs of contrasting Mendelian characters.