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- n. - A rare element of the boron group, sometimes associated
with yttrium or other related elements, as in euxenite and gadolinite.
Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium.
- noun - A soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
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