WordReference Random House Unabridged Dictionary of American English © 2026
pho•tom•e•try
(fō tom′i trē),USA pronunciation n.
pho•to•met•ric
(fō′tə me′trik),USA pronunciation pho′to•met′ri•cal, adj.
pho•tom′e•trist, pho•to•me•tri•cian
(fō′tə me trish′ən),USA pronunciation n.
- Opticsthe measurement of the intensity of light or of relative illuminating power.
- Opticsthe science dealing with such measurements.
- Neo-Latin photometria. See photo-, -metry
- 1815–25;
'photometric' also found in these entries (note: many are not synonyms or translations):