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actinometer
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English Dictionary: actinometer by the DICT Development Group
2 results for actinometer
From WordNet (r) 3.0 (2006) [wn]:
actinometer
n
  1. an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   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.
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