n. A piece of transparent substance bounded by two curved surfaces (usually spherical), or by a curved surface and a plane.n. In anatomy, in the eye, a double-convex body placed in the axis of vision behind the iris between the aqueous humor and the vitreous humor, serving to focus rays of light upon the retina; the crystalline lens. See first cut under eye.n. Figuratively, photography, from the use of lenses in that art.n. A genus of leguminous plants of the tribe Vicieæ.n. A genus of dicotyledonous plants of the family Mimosaceæ. There are about 14 species, of which the best-known is L. phaseoloides, the match-box bean or simitar-pod. See Entada, gogo, sea-bean, 1, and simitar-pod.n. In entomology: The crystalline lens or cone.n. One of the facets of the compound eye.n. In geology, a body of ore having a lenticular shape.n. A surface-condenser made of two round, dished plates bolted together, resembling in form a double-convex lens.