单词	photometer
释义	photometer noun pho·​tom·​e·​ter fō-ˈtä-mə-tər  : an instrument for measuring luminous intensity, luminous flux, illumination, or brightness Example Sentences Recent Examples on the Web So Masson's group is now developing a portable spectral photometer to augment its plasmonic tongue, thereby ensuring accurate readings. Jennifer Ouellette, Ars Technica, 28 May 2020 Word History Etymology New Latin photometrum, from phot- + -metrum -meter First Known Use 1779, in the meaning defined above Phrases Containing photometer flame photometer flame photometer Medical Definition photometer 1 of 2 noun pho·​tom·​e·​ter fō-ˈtäm-ət-ər  : an instrument for measuring the intensity of light, luminous flux, illumination or brightness by comparison of two unequal lights from different sources usually by reducing the illumination of one (as by varying the distance of the source or using a polarizing device) until the two lights appear equal with the amount of adjustment serving as the basis of comparison and the equality of illumination being judged by various means photometer 2 of 2 transitive verb : to examine with a photometer
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