Dictionary  haf•ni•umPronunciation: (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.
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