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photogen

[foh-tuh-juh n, -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.
Origin of photogen
1855-1860
1855-60; photo- + -gen
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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