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From Biology-Online Dictionary | Biology-Online Dictionary
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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.