• synonyms


[ ap-er-tom-i-ter ]
/ ˌæp ərˈtɒm ɪ tər /

noun Optics.

an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.

Nearby words

aperitive, apert, apert's syndrome, apert-crouzon syndrome, apertognathia, apertometer, aperture, aperture card, aperture priority, aperture ratio, aperture synthesis

Origin of apertometer

First recorded in 1875–80; apert(ure) + -o- + -meter Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019