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yt·tri·um 'i-trē-əm n a trivalent metallic element usu. included among the rare earth elements which it resembles chemically and with which it occurs in minerals symbol Y see ELEMENT (table)
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yt·tri·um (Y) (ĭґtre-əm) [from Ytterby, Sweden] a very rare metal, allied to cerium; atomic number, 39; atomic weight, 88.905.Medical dictionary. 2011.