EQUILATERAL
equilateral
(adjective) having all sides or faces equal
equilateral
(noun) a figure whose sides are all equal
Source: WordNet® 3.1
Etymology
Adjective
equilateral (not comparable)
(geometry, of a polygon) Having all the sides equal.
(geometry, of a polyhedron) Having all the faces equal.
(zoology) Having the two sides equal, as a surface divisible by a longitudinal median line into two halves of the same form.
(zoology) Having all the convolutions of the shell in one plane, chiefly of foraminifers.
Noun
equilateral (plural equilaterals)
A side exactly corresponding, or equal, to others.
A figure having all its sides equal.
Source: Wiktionary
E`qui*lat"er*al, a. Etym: [L. aequilateralis; aequus equal + latus,
lateris, side: cf. F. équilatéral.]
Definition: Having all the sides equal; as, an equilateral triangle; an
equilateral polygon. Equilateral hyperbola (Geom.), one whose axes
are equal.
– Equilateral shell (Zoöl.), 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.
E`qui*lat"er*al, n.
Definition: A side exactly corresponding, or equal, to others; also, a
figure of equal sides.
Source: Webster’s Unabridged Dictionary 1913 Edition