| emanation | 1. Any substance that flows out or is emitted from a source or origin. 2. The radiation from a radioactive element. Origin: L. E-mano, pp. -atus, to flow out Actinium emanation, radon-219. Radium emanation, radon-222. Thorium emanation, radon-220. See: emanon. (05 Mar 2000) |
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