noun
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An object, usually made of glass, that focuses or defocuses the light that passes through it.
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A device which focuses or defocuses electron beams.
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A convex shape bounded by two circular arcs, joined at their endpoints, the corresponding concave shape being a lune.
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A genus of the legume family; its bean.
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The transparent crystalline structure in the eye.
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(earth science) A body of rock, ice, or water shaped like a convex lens.
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A construct used in statically-typed functional programming languages to access nested data structures.
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(by extension) A way of looking, literally or figuratively, at something.