[1] : The Collaborative International Dictionary of English v.0.48

ytterbium \ytter"bium\, 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
see also:
erbium yttrium 

[2] : WordNet (r) 2.0

ytterbium
     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
see also:
yb atomic number 70 

[3] : Elements database 20001107

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.

Ytterbium >> Y Words
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