from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A supposed chemical element, later found to be a mixture of niobium and tantalum.
from the GNU version of the Collaborative International Dictionary of English
- n. A supposed new metal found in columbite, afterwards shown to be identical with columbium, or niobium.
from The Century Dictionary and Cyclopedia
- n. The name given by H. Rose to a supposed new chemical element which he believed that he had detected in the mineral columbite from Bavaria. He afterward recognized its identity with niobium.
Pelops + -ium (Wiktionary)