yttrium metal

noun Chemistry.
any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.
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yttrium metal
 
n
chem any one of a group of elements including yttrium and the related lanthanides, holmium, erbium, thulium, ytterbium, and lutetium

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Yttrium metal in a tungsten crucible was used as the source.
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