Dictionary
haf•ni•um
Pronunciation: (haf'nē-um, häf'-), [key]—
n. Chem.
a gray, toxic metallic element with a high melting point (over 2000°C), found in most zirconium minerals.
Symbol: Hf;
at. wt.: 178.49;
at. no.: 72;
sp. gr.: 12.1.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.