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Search Result for "actinometry": 
Wordnet 3.0

NOUN (1)

1. measuring the intensity of electromagnetic radiation (especially of the sun's rays);


The Collaborative International Dictionary of English v.0.48:

Actinometry \Ac`ti*nom"e*try\, n. 1. The measurement of the force of solar radiation. --Maury. [1913 Webster] 2. The measurement of the chemical or actinic energy of light. --Abney. [1913 Webster]
WordNet (r) 3.0 (2006):

actinometry n 1: measuring the intensity of electromagnetic radiation (especially of the sun's rays)