Bible Dictionaries
Amma Rays
Webster's Dictionary
Very penetrating rays not appreciably deflected by a magnetic or electric field, emitted by radioactive substances. The prevailing view is that they are non-periodic ether pulses differing from Rontgen rays only in being more penetrating.
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Bibliography Information
Webster, Noah. Entry for 'Amma Rays'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/amma-rays.html. 1828.