\Pris*mat"ic\, Prismatical \Pris*mat"ic*al\, a. [Cf.
F. prismatique.]
1. Resembling, or pertaining to, a prism; as, a prismatic
   form or cleavage.
2. Separated or distributed by a prism; formed by a prism;
   as, prismatic colors.
3. (Crystallog.) Same as {Orthorhombic}.
{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.