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From: Webster's Revised Unabridged Dictionary (1913)

 Yt·tri·um n.  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.]
 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.
 

From: Webster's Revised Unabridged Dictionary (1913)

 It·tri·um n.  See Yttrium.