Found 2 items, similar to actinometer.
English → English (WordNet) Definition: actinometer actinometer n : an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
English → English (gcide) Definition: Actinometer Actinometer \Ac`ti*nom"e*ter\, n. [Gr. ?, ?, ray + -meter] (a) An instrument for measuring the direct heating power of the sun's rays. (b) An instrument for measuring the actinic effect of rays of light. [1913 Webster]