You searched for: “actinometric
1. Pertaining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic.
2. A reference to any of several radiometric instruments; such as, a pyrheliometer, used chiefly for meteorological measurements of terrestrial and solar radiation.
This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 3) -ic (page 5)