Pe‐lo″pi‐um (?), n. [NL., fr. L. Pelops, brother of Niobe, Gr. �.] (Chem.) A supposed new metal found in columbite, afterwards shown to be identical with columbium, or niobium.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.