Ittrium

2 definitions found

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

  Ittrium \It"tri*um\ ([i^]t"tr[i^]*[u^]m), n. [NL.]
     See {Yttrium}.
     [1913 Webster]

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



  Yttrium \Yt"tri*um\, n. [NL., from Ytterby, in Sweden. See
     {Erbium}.] (Chem.)
     A rare metallic element of the boron-aluminium group, found
     in gadolinite and other rare minerals, and extracted as a
     dark gray powder. Symbol Y. Atomic number 39. Atomic weight,
     88.9. [Written also {ittrium}.]
     [1913 Webster +PJC]
  
     Note: Associated with yttrium are certain rare elements, as
           erbium, ytterbium, samarium, etc., which are separated
           in a pure state with great difficulty. They are studied
           by means of their spark or phosphorescent spectra.
           Yttrium is now regarded as probably not a simple
           element, but as a mixture of several substances.
           [1913 Webster]