prism

n 1: a polyhedron with two congruent and parallel faces (the

bases) and whose lateral faces are parallelograms

2: triangular shape and made of glass or quartz; used to

deviate a beam or invert an image [syn: {optical prism}]

PRISM

A distributed {logic language}.

["PRISM: A Parallel Inference System for Problem Solving",

S. Kasif et al, Proc 1983 Logic Prog Workshop, pp. 123-152].