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apertometer

[ap-er-tom-i-ter]
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noun Optics.
  1. an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.
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Origin of apertometer

First recorded in 1875–80; apert(ure) + -o- + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018