n.
Pronunciation: ' r ā - ˌ dän
Function: noun
Etymology: International Scientific Vocabulary, from radium
Date: 1918
: a heavy radioactive gaseous element formed by the decay of radium ― see ELEMENT table
RADON
Meaning of RADON in English
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012