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direct-vision spectroscope

American

noun

Optics.

a simple spectroscope consisting of a collimating lens and an Amici prism.

Etymology

Origin of direct-vision spectroscope

First recorded in 1875–80

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.