From The Collaborative International Dictionary of English v.0.48 [gcide]:
Photometer \Pho*tom"e*ter\, noun [Photo- + -meter: cf. F. photom['e]tre.] (Physics) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power. Photometric
From WordNet (r) 3.0 (2006) [wn]:
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