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aperture

One entry found.

Main Entry: ap·er·ture
Pronunciation: \ˈap-ə(r)-ˌchr, -chər, -ˌtyr, -ˌtr\
Function: noun
Etymology: Middle English, from Latin apertura, from apertus, past participle of aperire to open
Date: 15th century

1 : an opening or open space : hole
2 a : the opening in a photographic lens that admits the light b : the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument c : the diameter of the objective lens or mirror of a telescope


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