ˈprɪzm n. 1 a
solid geometric figure whose two ends are
similar,
equal,
and parallel rectilinear figures, and whose sides are parallelograms. 2 a
transparent body in
this form, usu.
triangular with refracting surfaces at an
acute angle with
each other,
which separates
white light into a
spectrum of colours. øøprismal adj. [LL prisma f. Gk prisma prismatos
thing sawn f. prizo to saw]