photogen

[foh-tuh-juh n, -jen]
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noun

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

Origin of photogen

First recorded in 1855–60; photo- + -gen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for photogen

Historical Examples of photogen