1. optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image; [syn: prism, optical prism]
WordNet (r) 3.0 (2006):
optical prism
n 1: optical device having a triangular shape and made of glass
or quartz; used to deviate a beam or invert an image [syn:
prism, optical prism]