From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: 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[deg] aperture.
From WordNet (r) 3.0 (2006) [wn]:
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