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

From WordNet (r) 3.0 (2006) :

  ytterbium
      n 1: a soft silvery metallic element; a rare earth of the
           lanthanide series; it occurs in gadolinite and monazite and
           xenotime [syn: ytterbium, Yb, atomic number 70]

From The Elements (07Nov00) :

  ytterbium
  Symbol: Yb
  Atomic number: 70
  Atomic weight: 173.04
  Silvery metallic element of the lanthanoids. Seven natural isotopes and
  ten artificial isotopes are known.  Used in certain steels. Discovered
  by
  J.D.G. Marignac in 1878.
  

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