Dictionary
po•lo•ni•um
Pronunciation: (pu-lō'nē-um), [key]—
n. Chem.
a radioactive element discovered by Pierre and Marie Curie in 1898;
Symbol: Po;
at. no.: 84;
at. wt.: about 210.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.