Tri*lat"er*al (?), a.[L. trilaterus; tri- (see Tri-) + latus, lateris, side: cf. F. trilat'eral. See Lateral.] Geom.
Having three sides; being three-sided; as, a trilateral triangle.
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Tri*lat"er*al*ly, adv. --
Tri*lat"er*al*ness, n.
© Webster 1913.