English definition of Lens

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Definition of lens

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Lens (n.) 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..

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Fresnel Lens :: Fresnel lens () See under Lens.

Mercer :: Mercer (n.) Originally, a dealer in any kind of goods or wares; now restricted to a dealer in textile fabrics, as silks or woolens..

Fres''nel'' Lan''tern :: Fres'nel' lan'tern () A lantern having a lamp surrounded by a hollow cylindrical Fresnel lens.

Sunglow :: Sunglass (n.) A convex lens of glass for producing heat by converging the sun's rays into a focus.

Couch :: Couch (v. t.) To treat by pushing down or displacing the opaque lens with a needle; as, to couch a cataract..

Amasthenic :: Amasthenic (a.) Uniting the chemical rays of light into one focus, as a certain kind of lens; amacratic..

Specular :: Specular (a.) Assisting sight, as a lens or the like..

Stereoplasm :: Stereomonoscope (n.) An instrument with two lenses, by which an image of a single picture projected upon a screen of ground glass is made to present an appearance of relief, and may be viewed by several persons at once..

Vulturine :: Vulturine (a.) Of or pertaining to a vulture; resembling a vulture in qualities or looks; as, the vulturine sea eagle (Gypohierax Angolensis); vulturine rapacity..

Decadency :: Decadency (n.) A falling away; decay; deterioration; declension. The old castle, where the family lived in their decadence..

Theme :: Theme (n.) A noun or verb, not modified by inflections; also, that part of a noun or verb which remains unchanged (except by euphonic variations) in declension or conjugation; stem..

Vergency :: Vergency (n.) The reciprocal of the focal distance of a lens, used as measure of the divergence or convergence of a pencil of rays..

Semilenticular :: Semilenticular (a.) Half lenticular or convex; imperfectly resembling a lens.

Dill :: Dill (n.) An herb (Peucedanum graveolens), the seeds of which are moderately warming, pungent, and aromatic, and were formerly used as a soothing medicine for children; -- called also dillseed..

Eyeglass :: Eyeglass (n.) A lens of glass to assist the sight. Eyeglasses are used singly or in pairs.

Graphoscope :: Graphoscope (n.) An optical instrument for magnifying engravings, photographs, etc., usually having one large lens and two smaller ones..

Declension :: Declension (n.) The form of the inflection of a word declined by cases; as, the first or the second declension of nouns, adjectives, etc..

Ophthalmometer :: Ophthalmometer (n.) An instrument devised by Helmholtz for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained..

Rue :: Rue (n.) A perennial suffrutescent plant (Ruta graveolens), having a strong, heavy odor and a bitter taste; herb of grace. It is used in medicine..

Aplanatic :: Aplanatic (a.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens..