COLUMBIUMS

Noun

columbiums

plural of columbium

Source: Wiktionary

COLUMBIUM

Co*lum"bi*um, n. Etym: [NL., fr. Columbia America.] (Chem.)

Definition: A rare element of the vanadium group, first found in a variety of the mineral columbite occurring in Connecticut, probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now more commonly called niobium.

Source: Webster’s Unabridged Dictionary 1913 Edition

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