WordReference Random House Unabridged Dictionary of American English © 2026
mi•cro•pho•tom•e•ter
(mī′krō fō tom′i tər),USA pronunciation n. [Optics.]
mi•cro•pho•to•met•ric
(mī′krō fō′tə me′trik),USA pronunciation adj.
mi′cro•pho′to•met′ri•cal•ly, adv.
mi′cro•pho•tom′e•try, n.
- a photometer adapted for measuring the intensity of light emitted, transmitted, or reflected by minute objects.
- 1895–1900; micro- + photometer
mi′cro•pho•tom′e•try, n.