an instrument used in measuring the intensity of light, esp. in determining its relative intensity from different sources
Origin of photometerphoto- + -meter
An instrument for measuring a property of light, especially luminous intensity or flux.
(third-person singular simple present photometers, present participle photometering, simple past and past participle photometered)
- (astronomy) To measure some aspect of light (from a star) using a photometer.
photo- +"Ž -meter