Source : Webster's Revised Unabridged Dictionary (1913)

Actinometric \Ac`ti*no*met"ric\, a.
   Pertaining to the measurement of the intensity of the solar
   rays, either (a) heating, or (b) actinic.

Source : WordNet®

actinometric
     adj : of or related to actinometry [syn: {actinometrical}]