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apertometer

[ ap-er-tom-i-ter ]
/ ˌæp ərˈtɒm ɪ tər /
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noun Optics.
an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.
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Apostrophes can be tricky; prove you know the difference between "it’s" and "its" in this crafty quiz!
Question 1 of 8
On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

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. 2022
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