a. [ Equi- + angular. Cf. Equangular. ] Having equal angles; as, an equiangular figure; a square is equiangular. [ 1913 Webster ]
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. [ 1913 Webster ]