yttrium metal


Definition of yttrium metal

  1. :  any of a group of metals separable as a group from other metals occurring with them and in addition to yttrium including the rare-earth metals holmium, erbium, thulium, ytterbium, and lutetium and sometimes gadolinium, terbium, and dysprosium — compare terbium metal

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a rounded knoll or a ridge of ice

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