apertometer

[ap-er-tom-i-ter]

noun Optics.

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

Nearby words

  1. aperitive,
  2. apert,
  3. apert's syndrome,
  4. apert-crouzon syndrome,
  5. apertognathia,
  6. aperture,
  7. aperture card,
  8. aperture priority,
  9. aperture ratio,
  10. aperture synthesis

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. 2019