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| Matching Terms: | | atomic number 8, atomic number 80, atomic number 81, atomic number 82, atomic number 83, atomic number 84, atomic number 85, atomic number 87, atomic number 88, atomic number 89
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 WordNet Dictionary |
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| | Definition: | | [n] a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health |
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| | Synonyms: | | radon, Rn |
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| | See Also: | | argonon, chemical element, element, inert gas, noble gas |
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