a piece of glass or other transparent material with two opposite regular surfaces, at least one of which is curved, that is used to form an image by focusing rays of light
a combination of two or more lenses, e.g. in a camera or microscope
a device for directing or focusing radiation other than light, e.g. sound waves or electrons
something shaped like an optical lens with both sides convex
a transparent lens-shaped or nearly spherical body in the eye that focuses light rays on the retina
lensed adj
lensless adj
[Latin lent-, lens lentil; from its shape]