RADON


Meaning of RADON in English

ra ‧ don /ˈreɪdɒn $ -dɑːn/ BrE AmE noun [uncountable]

[ Date: 1900-2000 ; Origin: radium ]

a ↑ radioactive gas that is used in the treatment of diseases such as ↑ cancer . It is a chemical ↑ element : symbol Rn

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.