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actinometry
Variant of actinometer
noun
- Physics an instrument for measuring the intensity of the sun's rays, or the actinic effect of light rays
- Photog. exposure meter
Related Forms:
- actinometric adjective
- actinometry noun
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.