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photogen

American  
[foh-tuh-juhn, -jen] / ˈfoʊ tə dʒən, -ˌdʒɛn /

noun

  1. a light oil obtained by the distillation of bituminous shale, coal, or peat: once commercially produced chiefly as an illuminant and as a solvent.

  2. Biology. a photogenic organ, organism, or substance.

Etymology

Origin of photogen

First recorded in 1855–60; photo- + -gen

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.