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
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- 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 […]
- Prismoid
noun, Geometry. 1. a solid having sides that are trapezoids and bases or ends that are parallel and similar but not congruent polygons. Compare prism (def 2). noun 1. a prismatoid having an equal number of vertices in each of the two parallel planes and whose sides are trapeziums or parallelograms
- Prism-spectrometer
noun, Optics. 1. See under spectrometer. spectrometer [spek-trom-i-ter] /spɛkˈtrɒm ɪ tər/ noun, Optics. 1. an optical device for measuring wavelengths, deviation of refracted rays, and angles between faces of a prism, especially an instrument (prism spectrometer) consisting of a slit through which light passes, a collimator, a prism that deviates the light, and a telescope […]