Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

photometric
     adj : of or relating to photometry [syn: {photometrical}]