From The Collaborative International Dictionary of English v.0.48:

Ytterbium \Yt*ter"bi*um\, 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.
   [1913 Webster]

   Note: Ytterbium is associated with other rare elements, and
         probably has not been prepared in a pure state.
         [1913 Webster]
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