prismatical

{ } a. [ Cf. F. prismatique. ] 1. Resembling, or pertaining to, a prism; as, a prismatic form or cleavage. [ 1913 Webster ]

2. Separated or distributed by a prism; formed by a prism; as, prismatic colors. [ 1913 Webster ]

3. (Crystallog.) Same as Orthorhombic. [ 1913 Webster ]

Prismatic borax (Chem.), borax crystallized in the form of oblique prisms, with ten molecules of water; -- distinguished from octahedral borax. --
Prismatic colors (Opt.), the seven colors into which light is resolved when passed through a prism; primary colors. See Primary colors, under Color. --
Prismatic compass (Surv.), a compass having a prism for viewing a distant object and the compass card at the same time. --
Prismatic spectrum (Opt.), the spectrum produced by the passage of light through a prism. [ 1913 Webster ]