telephotometer

[ tel-uh-foh-tom-i-ter ]
/ ˌtɛl ə foʊˈtɒm ɪ tər /

noun

an instrument for measuring the amount of light emanating from a distant object.

Origin of telephotometer

First recorded in 1925–30; tele-1 + photometer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019