HyperDic: radon

English > 1 sense of the word radon:
NOUNsubstanceradon, Rn, atomic number 86a radioactive gaseous element formed by the disintegration of radium
radon > pronunciation
Soundsrey'daa.n
RhymesAbidjan ... Yukon: 149 rhymes with aan...
English > radon: 1 sense > noun 1, substance
MeaningA 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.
SynonymsRn, atomic number 86
Broaderchemical element, elementAny 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
noble gas, inert gas, argononAny of the chemically inert gaseous elements of the helium group in the periodic table
Spanishnúmero atómico 86, radon, radón, Rn
Catalannúmero atòmic 86, radó, Rn

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