transcription, транскрипция: [ ˈrā-ˌdän ]
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's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003