prism

πρίω (Ancient Greek)

πρίζειν (Ancient Greek)

πρῖσμα (Ancient Greek)

πρίσμα (Ancient Greek)

prisma (Late Latin)

prism (English)

(geometry) A polyhedron with parallel ends of the same size and shape, the other faces being parallelogram-shaped sides.. A crystal in which the faces are parallel to the vertical axis.. A transparent block in the shape of a prism (typically with triangular ends), used to split or reflect light.