Dictionary entry

Trilateral

Webster's Dictionary 1913

Tri‐lat″er‐al (?), a.[L. trilaterus; tri- (see Tri-) + latus, lateris, side: cf. F. trilatéral. See Lateral.] (Geom.) Having three sides; being three-sided; as, a trilateral triangle. — Tri‐lat″er‐al‐ly, adv. — Tri‐lat″er‐al‐ness, n.