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The Collaborative International Dictionary of English v.0.48 (gcide)

Equilateral \E`qui*lat"er*al\, n.
A side exactly corresponding, or equal, to others; also, a
figure of equal sides.
[1913 Webster]


Equilateral \E`qui*lat"er*al\, a. [L. aequilateralis; aequus
equal latus, lateris, side: cf. F. ['e]quilat['e]ral.]
Having all the sides equal; as, an equilateral triangle; an
equilateral polygon.
[1913 Webster]

{Equilateral hyperbola} (Geom.), one whose axes are equal.

{Equilateral shell} (Zo["o]l.), one in which a transverse
line drawn through the apex of the umbo bisects the valve,
or divides it into two equal and symmetrical parts.

{Mutually equilateral}, applied to two figures, when every
side of the one has its equal among the sides of the
other.
[1913 Webster]