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Kellner eyepiece

American

[kel-ner] / ˈkɛl nər /

noun

Optics.

a Ramsden eyepiece having an achromatic lens, used in binoculars.

Etymology

Origin of Kellner eyepiece

After Carl Kellner (1826–55), German opticist and lens maker

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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.