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| ap·er·ture [ áppər chr ] (plural ap·er·tures) |
noun |
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| Definition: |
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1. narrow opening: a small narrow opening
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2. opening through lens or mirror: a fixed or adjustable opening in a piece of equipment such as a camera or microscope that lets light pass through a lens or mirror
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3. size of aperture: the diameter of an aperture in a piece of equipment such as a camera
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| [Mid-17th century. < Latin apertura< apert-, past participle of aperire "to open"] |
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  ap·er·tur·al adjective |
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