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.
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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