Equiangular \E`qui*an"gu*lar\, a. [Equi- + angular. Cf. {Equangular}.] 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.