Equilateral
[,iːkwɪ'læt(ə)r(ə)l;,ekwɪ-] or ['ikwə'lætərəl]
Definition
(noun.) a figure whose sides are all equal.
(adj.) having all sides or faces equal .
Edited by Gertrude--From WordNet
Definition
(a.) Having all the sides equal; as, an equilateral triangle; an equilateral polygon.
(n.) A side exactly corresponding, or equal, to others; also, a figure of equal sides.
Editor: Peter