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apertometer

American  
[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.

Etymology

Origin of apertometer

First recorded in 1875–80; apert(ure) + -o- + -meter

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.