Meaning

noun measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source

noun photographic equipment that measures the intensity of light

originEtymology tree Proto-Indo-European *bʰeh₂- Proto-Indo-European *bʰéh₂os Proto-Hellenic *pʰáwos Ancient Greek φᾰ́ος (phắos) Ancient Greek φῶς (phôs) Ancient Greek φωτο- (phōto-)der. English photo- Proto-Indo-European *meh₁- Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Hellenic *-tron Ancient Greek -τρον (-tron) Ancient Greek μέτρον (métron)der. English -meter English photometer From…

Etymology from Wiktionary, CC BY-SA 3.0