出典:Wiktionary
From late Middle English, from Latin apertūra (“an opening”), from aperiō (“to uncover, make または lay bare”) + -tūra (“-ure”, action noun suffix). Doublet of overture.
The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.
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