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Having three sides; being three-sided; as, a trilateral triangle. -- Tri*lat"er*al*ly, adv. -- Tri*lat"er*al*ness, n.

A syllogism with three conditional propositions, the major premises of which are disjunctively affirmed in the minor. See Dilemma.

Of, pertaining to, or included by, three lines; as, trilinear coördinates.

Containing, or consisting of, three languages; expressed in three languages. The much-noted Rosetta stone . . . bears upon its surface a trilingual inscription. I. Taylor.

Consisting of three letters; trigrammic; as, a triliteral root or word. -- n.

A monument consisting of three stones; especially, such a monument forming a kind of doorway, as among the ancient Celts.

A compound crystal, consisting of three individuals.

A genus of liliaceous plants; the three-leaved nightshade; -- so called because all the parts of the plant are in threes.

Having three lobes.

and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment.

Having three cells or cavities; as, a trilocular capsule; a trilocular heart.

A series of three dramas which, although each of them is in one sense complete, have a close mutual relation, and form one historical and poetical picture. Shakespeare's " Henry VI." is an example. On the Greek stage, a drama, or acted story, consisted in reality of three dramas, called together a trilogy, and performe…

Having three lights [R.]

Marked with three spots, or maculæ.

Having, or consisting of, three members.

A division of Coleoptera including those which have but three joints in the tarsi.

Having the parts in threes.

A term or period of three months.

Of or pertaining to a trimester, or period of three months; occurring once in every three months; quarterly.

Consisting of three poetical measures. -- n.