The Collaborative International Dictionary
Photometrical
Photometric \Pho`to*met"ric\, Photometrical \Pho`to*met"ric*al\, a. [Cf. F. photom['e]trique.] Of or pertaining to photometry, or to a photometer.
Wiktionary
photometrical
a. photometric
WordNet
photometrical
adj. of or relating to photometry [syn: photometric]