| Prism 1. (n.) A solid whose bases or ends are any similar, equal, and parallel plane figures, and whose sides are parallelograms. 2. (n.) A transparent body, with usually three rectangular plane faces or sides, and two equal and parallel triangular ends or bases; -- used in experiments on refraction, dispersion, etc. 3. (n.) A form the planes of which are parallel to the vertical axis. See Form. Thesaurus Entries achromatic lens, astigmatic lens, burning glass, camera, coated lens, concave lens, concavo-convex lens, condenser, convex lens, eyeglass, eyepiece, glass, hand lens, lens, magnifier, magnifying glass, meniscus, object glass, objective, objective prism, ocular, reader, reading glass, telephoto lens, toric lens, varifocal lens, zoom lens |