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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 colours.

3. (Science: chemistry) same as orthorhombic.

(Science: chemistry) prismatic borax, borax crystallized in the form of oblique prisms, with ten molecules of water; distinguished from octahedral borax.

(Science: optics) prismatic colours, the spectrum produced by the passage of light through a prism.

Origin: Cf. F. Prismatique.