The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] PhotometricianWordNet (r) 3.0 (2006):
photometric adj 1: of or relating to photometry [syn: photometric, photometrical]