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De - Pt| English Dictionary: crystalline lens | by the DICT Development Group |
| 3 results for crystalline lens | |
| From WordNet (r) 3.0 (2006) [wn]: | |
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| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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Lens \Lens\ (l[ecr]nz), n.; pl. {Lenses} (-[ecr]z). [L. lens a lentil. So named from the resemblance in shape of a double convex lens to the seed of a lentil. Cf. {Lentil}.] (Opt.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure. Lenses Note: Of spherical lenses, there are six varieties, as shown in section in the figures herewith given: viz., a plano-concave; b double-concave; c plano-convex; d double-convex; e converging concavo-convex, or converging meniscus; f diverging concavo-convex, or diverging meniscus. {Crossed lens} (Opt.), a double-convex lens with one radius equal to six times the other. {Crystalline lens}. (Anat.) See {Eye}. {Fresnel lens} (Opt.), a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; -- so called from the inventor. {Multiplying} {lens [or] glass} (Opt.), a lens one side of which is plane and the other convex, but made up of a number of plane faces inclined to one another, each of which presents a separate image of the object viewed through it, so that the object is, as it were, multiplied. {Polyzonal lens}. See {Polyzonal}. | |
| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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Crystalline \Crys"tal*line\ (kr?s"tal-l?n [or] -l?n; 277), a. [L. crystallinus, from Gr. [?][?][?][?]: cf. F. cristallin. See {Crystal}.] 1. Consisting, or made, of crystal. Mount, eagle, to my palace crystalline. --Shak. 2. Formed by crystallization; like crystal in texture. Their crystalline structure. --Whewell. 3. Imperfectly crystallized; as, granite is only crystalline, while quartz crystal is perfectly crystallized. 4. Fig.: Resembling crystal; pure; transparent; pellucid. [bd]The crystalline sky.[b8] --Milton. {Crystalline heavens}, or {Crystalline spheres}, in the Ptolemaic system of astronomy, two transparent spheres imagined to exist between the region of the fixed stars and the primum mobile (or outer circle of the heavens, which by its motion was supposed to carry round all those within it), in order to explain certain movements of the heavenly bodies. {Crystalline lens} (Anat.), the capsular lenslike body in the eye, serving to focus the rays of light. It consists of rodlike cells derived from the external embryonic epithelium. | |
