terbium

terbium Definition

ter·bium (tʉr′bē əm)

noun

a soft, silver-gray, ductile chemical element, one of the rare-earth elements, found in gadolinite and other minerals: symbol, Tb; at. no., 65

Etymology: ModL: so named (1843) by Mosander, its discoverer, after Ytterby: see erbium

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