Bible Dictionaries
Actinometer
Webster's Dictionary
(1):
(n.) An instrument for measuring the direct heating power of the sun's rays.
(2):
(n.) An instrument for measuring the actinic effect of rays of light.
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Bibliography Information
Webster, Noah. Entry for 'Actinometer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/actinometer.html. 1828.