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Definition of: astrophotometer
(as′trō·fō·tom′ə·tər) noun
An instrument for determining the brightness of stars by comparing them with a light source of standard brightness.
—as′tro·pho·tom′e·try n.
—as·tro·pho·to·met·ri·cal (as′trō·fō′tə·met′ri·kəl) adjective
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