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Thursday, January 22nd, 2026
the Second Week after Epiphany
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Bible Dictionaries
Actinometer

Webster's Dictionary

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(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.

Bibliography Information
Webster, Noah. Entry for 'Actinometer'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/actinometer.html. 1828.
 
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