emanation








noun

  1. an act or instance of emanating.
  2. something that emanates or is emanated.
  3. Physical Chemistry. a gaseous product of radioactive disintegration, including radon, thoron, and actinon. Symbol: Em

noun

  1. an act or instance of emanating
  2. something that emanates or is produced; effusion
  3. a gaseous product of radioactive decay, such as radon
n.

1560s, from Late Latin emanationem (nominative emanatio), noun of action from past participle stem of Latin emanare “flow out, arise, proceed,” from ex- “out” (see ex-) + manare “to flow,” from PIE root *ma- “damp.”

n.

  1. Something that issues from a source; an emission.
  2. Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.
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