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

Other words from isophote

isophotal \ˌī-sə-ˈfō-təl \ adjective

First Known Use of isophote

circa 1909, in the meaning defined above

History and Etymology for isophote

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

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The first known use of isophote was circa 1909

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