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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

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.