columbium[kə lum′bē əm]
columbium definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Origin: ModL: so named (1801) by C. Hatchett (1765-1847), British chemist ; from Columbia plush -ium, because the ore had been brought from Massachusetts
columbium definition by American Heritage Dictionary
noun Symbol Cb
Niobium. No longer in scientific use.
Origin: After Columbia2.