RADIOACTINIUM


Meaning of RADIOACTINIUM in English

/ray'dee oh ak tin"ee euhm/ , n. Chem.

the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227

[ 1905-10; RADIO- + ACTINIUM ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .