EQUIANGULAR
equiangular
(adjective) having all angles equal
Source: WordNet® 3.1
Etymology
Adjective
equiangular (not comparable)
(geometry) Of a polygon, having all interior angles equal. This is not necessarily a regular polygon, since that would also be equilateral; a rectangle is equiangular but not equilateral, unless it is a square.
Source: Wiktionary
E`qui*an"gu*lar, a. Etym: [Equi- + angular. Cf. Equangular.]
Definition: Having equal angles; as, an equiangular figure; a square is
equiangular. Equiangular spiral. (Math.) See under Spiral, n.
– Mutually equiangular, applied to two figures, when every angle of
the one has its equal among the angles of the other.
Source: Webster’s Unabridged Dictionary 1913 Edition