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Lens definition

lĕnz
lenses
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Frequency:
A combination of two or more such pieces, sometimes with other optical devices such as prisms, used to form an image for viewing or photographing.
noun
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A thin piece of glass or plastic, as on a pair of sunglasses, that transmits light without refraction.
noun
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A transparent structure behind the iris of the eye that focuses light entering the eye on the retina.
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A ground or molded piece of glass, plastic, or other transparent material with opposite surfaces either or both of which are curved, by means of which light rays are refracted so that they converge or diverge to form an image.
noun
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The definition of a lens is a piece of glass or other hard clear material molded with one side flat and the other curved or both sides curved that forms an image by bringing together or spreading the light that passes through it.

An example of lens is the clear pieces covering the eyes in eye glasses.

An example of lens is what a camera uses to take photos.

noun
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A device or phenomenon (such as a gravitational field) that causes light or other radiation to converge or diverge by an action analogous to that of a lens.
noun
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To bend or distort (light, for example) by means of a lens, especially a gravitational field.
verb
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Any of various devices used to focus microwaves, electrons, or sound waves.
noun
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A ground or molded piece of glass, plastic, or other transparent material with opposite surfaces either or both of which are curved, by means of which light rays are refracted so that they converge or diverge to form an image.
noun
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The glass or plastic elements that focus light onto analog film or a digital sensor in a still or video camera. Lens quality is just as important in digital cameras as it was in Daguerreotype imaging of the mid-1800s (see image). See digital camera and kit lens.
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A transparent, biconvex structure in the eye of a vertebrate or cephalopod that is located between the iris and the vitreous humor and focuses light rays entering through the pupil to form an image on the retina.
noun
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A similar structure in many invertebrates.
noun
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(informal) To make a photograph or movie of.
verb
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(anat.) A transparent, biconvex body situated between the iris and the vitreous humor of the eye: it focuses upon the retina light rays entering the pupil.
noun
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A piece of glass, or other transparent substance, with two curved surfaces, or one plane and one curved, regularly bringing together or spreading rays of light passing through it: a lens or combination of lenses is used in optical instruments, eyeglasses, etc. to form an image.
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A combination of two or more such pieces.
noun
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To photograph.
verb
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To make a film of.
verb
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A combination of two or more such pieces, sometimes with other optical devices such as prisms, used to form an image for viewing or photographing.
noun
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A thin piece of glass or plastic, as on a pair of sunglasses, that transmits light without refraction.
noun
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A transparent, biconvex structure in the eye of a vertebrate or cephalopod that is located between the iris and the vitreous humor and focuses light rays entering through the pupil to form an image on the retina.
noun
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A similar structure in many invertebrates.
noun
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A device that causes radiation to converge or diverge by an action analogous to that of an optical lens. The system of electric fields used to focus electron beams in electron microscopes is an example of a lens.
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A piece of glass or plastic shaped so as to focus or spread light rays that pass through it, often for the purpose of forming an image.
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A combination of two or more such lenses, as in a camera or telescope.
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A taxonomic genus within the family Fabaceae — the lentils.
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Other Word Forms

Noun

Singular:
lens
Plural:
lenses

Origin of lens

  • New Latin lēns from Latin lentil (from the shape of a double convex lens)

    From American Heritage Dictionary of the English Language, 5th Edition

  • Latin lens (“a lentil bean”)

    From Wiktionary

Lens Sentence Examples

  • If not, the substitution of an achromatic lens will be of no advantage.

  • Its object is a practical one, to determine by scientific considerations the shape of lens best adapted to improve the capabilities of the telescope, which had been invented not long before.

  • Eyes are open invaginations without crystalline lens.

  • A, Early condition before the lens is deposited, showing the folding of the epidermic cell-layer into three.

  • Curiously enough, however, they differ from the cephalic Molluscan eye in the fact that, as in the vertebrate eye, the filaments of the optic nerve penetrate the retina, and are connected with the re surfaces of the nerve-end cells nearer the lens instead of with the opposite end.

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