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Webster 1913 Edition
Photometer
Pho-tom′e-ter
,Noun.
[
Photo-
+ -meter
: cf. F. photomètre
.] (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.
Webster 1828 Edition
Photometer
PHOTOM'ETER
,Noun.
An instrument for measuring the relative intensities of light.