apertometer

[ 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.

Origin of apertometer

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

Words nearby apertometer

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