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.
Pris*mat"ic*al*ly, adv. In the form or manner of a prism; by means of a
prism.
Pris`ma*toid"al (?), a. [Gr. &?;, &?;, prism + -oid: F. prismatoÔde.]
Having a prismlike form. Ure.
Pris"moid (prz"moid), n. [Cf. F. prismtoÔde.] A body that approaches to
the form of a prism.
Pris*moid"al (?), a. Having the form of a prismoid; as, prismoidal
solids.