TRILATERAL
Source: 566, 567
trilateral. Trilateral, a. having three sides or three angles
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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.