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Definition of Pelopium
1. n. A supposed new metal found in columbite, afterwards shown to be identical with columbium, or niobium.
Definition of Pelopium
1. Noun. (obsolete) A supposed chemical element, later found to be a mixture of niobium and tantalum. ¹
¹ Source: wiktionary.com
Medical Definition of Pelopium
1.