Library / English Dictionary

    RADON

    Pronunciation (US): Play  (GB): Play

     I. (noun) 

    Sense 1

    Meaning:

    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 healthplay

    Synonyms:

    atomic number 86; radon; Rn

    Classified under:

    Nouns denoting substances

    Hypernyms ("radon" is a kind of...):

    chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

    argonon; inert gas; noble gas (any of the chemically inert gaseous elements of the helium group in the periodic table)

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