Prismatic-layer
noun
1.
the middle layer of the shell of certain mollusks, consisting chiefly of crystals of calcium carbonate.
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- Prismatic-telescope
noun, Surveying. 1. a telescope having an eyepiece at the side or top equipped with a reflecting prism, used for taking sights at steep angles.
- Prismatoid
noun, Geometry. 1. a polyhedron having its vertices lying on two parallel planes. noun 1. a polyhedron whose vertices lie in either one of two parallel planes Compare prism (sense 3), prismoid
- Prism bar
prism bar n. A graduated series of prisms mounted on a frame and used in ocular diagnosis.
- Prism-binocular
noun 1. Usually, prism binoculars. Optics. binocular (def 1).
- Prism-diopter
noun, Optics. 1. a unit of prismatic deviation, in which the number one represents a prism that deflects a beam of light a distance of one centimeter on a plane placed normal to the initial direction of the beam and one meter away from the prism. prism diopter n. Abbr. PD The unit measuring the […]