isophote

noun iso·phote \ˈī-sə-ˌfōt\

Definition of ISOPHOTE

: a curve on a chart joining points of equal light intensity from a given source

— iso·phot·al \ˌī-sə-ˈfō-təl\ adjective

International Scientific Vocabulary is- + -phote (from Greek phōt-, phōs light) — more at fancy

First Known Use: circa 1909

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