(n) a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime, Syn.Yb, atomic number 70
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ NL., fr. Ytterby, in Sweden. See Erbium. ] (Chem.) 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. [ 1913 Webster ]
☞ Ytterbium is associated with other rare elements, and probably has not been prepared in a pure state. [ 1913 Webster ]
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