Meaning of photometer

pho•tom•e•ter

Pronunciation: (fō-tom'i-tur), [key]
— n. Optics.
  1. an instrument that measures luminous intensity or brightness, luminous flux, light distribution, color, etc., usually by comparing the light emitted by two sources, one source having certain specified standard characteristics.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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