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phot

[fot, foht] /fɒt, foʊt/
noun, Optics.
1.
a unit of illumination, equal to 1 lumen per square centimeter.
Abbreviation: ph.
Origin
1915-1920
1915-20; < Greek phōt-, stem of phôs (contraction of pháos) light

phot-

1.
variant of photo- before a vowel:
photalgia.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for phot

phot

/fɒt; fəʊt/
noun
1.
a unit of illumination equal to one lumen per square centimetre. 1 phot is equal to 10 000 lux
Word Origin
C20: from Greek phōs light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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9
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