- 1. Any substance that flows out or is emitted from a source or origin. 2. The radiation from a radioactive element. [L. e- mano, pp. -atus, to flow out]
* * *em·a·na·tion .em-ə-'nā-shən n1) the action of emanating2 a) something that emanates or is produced by emanationb) a heavy gaseous element produced by radioactive disintegration <radium \emanation>
* * *em·a·na·tion (em″ə-naґshən) [L. e out + manare to flow] that which is given off, such as a gaseous disintegration product given off from radioactive substances.
Medical dictionary. 2011.