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diaphragm [diaphragms]▼(optics: structure with a central aperture used to limit the passage of light)noun[UK: ˈdaɪə.fræm] [US: ˈdaɪə.ˌfræm]
aperture [apertures]▼(diameter of the aperture)noun[UK: ˈæ.pə.tʃə(r)] [US: ˈæ.pər.tʃər]
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