D defs.my
Entry 2 senses Webster, 1913

Actinometry

· Ac·ti·nom·e·try · IPA /ˌæktɪˈnɒmətɹi/
01 n. The measurement of the force of solar radiation.
  1. 1.
    The measurement of the force of solar radiation.
  2. 2.
    The measurement of the chemical or actinic energy of light.