n. Any of several instruments used to measure various aspects of the intensity of light.
v. To measure some aspect of light (from a star) using a photometer.
the GNU version of the Collaborative International Dictionary of English
n. An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.
The Century Dictionary and Cyclopedia
n. An instrument used to measure the intensity of light, specifically to compare the relative ! intensities of the light emitted from different sources.
n. In photography, a device for determining the proper length of time for exposure. See actinometer.
n. An instrument for determining the length of time proper for photographic exposures.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. photographic equipment that measures the intensity of light
n. measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source
Word Usage
"To accomplish this mission, a space-based photometer is being developed that employs a 0. 95m aperture Schmidt telescope coupled to a very large focal plane array (FPA) measuring 14” (L) x 14” (W) x 10” (D)."