a. [ L. aequilateralis; aequus equal + latus, lateris, side: cf. F. équilatéral. ] Having all the sides equal;
Equilateral hyperbola (Geom.),
Equilateral shell (Zoöl.),
Mutually equilateral,
n. A side exactly corresponding, or equal, to others; also, a figure of equal sides. [ 1913 Webster ]