actinometer
The American Illustrated Medical Dictionary · 1913 · p. 5
(ak-tin-om’et-er) (Gr. ἀκτίς ray + μέτρον measure]. An apparatus for measuring the penetrating power of actinic rays.
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A Dictionary of Aviation (1911)
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
Chandler's Encyclopedia (1898)
Nuttall's Standard Dictionary of the English Language (1890)
Zell's Condensed Dictionary (1879)
Dictionary of Science, Literature and Art (1854)
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