Chem.
an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived.
[ 1900-05 ]
Chem.
an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived.
[ 1900-05 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012