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apostilb

American

[ap-uh-stilb] / ˈæp əˌstɪlb /

noun

Optics.

a unit of luminance equal to one ten thousandth of a lambert.

Etymology

Origin of apostilb

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.