Source : Webster's Revised Unabridged Dictionary (1913)

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.