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apertometer

[ap-er-tom-i-ter] /ˌæp ərˈtɒm ɪ tər/
noun, Optics.
1.
an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.
Origin
1875-1880
1875-80; apert(ure) + -o- + -meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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