Dictionary
ce•ri•um
Pronunciation: (sēr'ē-um), [key]—
n.
a steel-gray, ductile metallic element of the rare-earth group found only in combination.
Symbol: Ce;
at. wt.: 140.12;
at. no.: 58.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.