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aperture [apertures]▼(hole restricting the diameter of the lightpath through one plane)noun[UK: ˈæ.pə.tʃə(r)] [US: ˈæ.pər.tʃər]
diaphragm [diaphragms]▼(anatomy: sheet of muscle separating thorax from abdomen)noun[UK: ˈdaɪə.fræm] [US: ˈdaɪə.ˌfræm]
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