Yttrium
Pronunciation : Yt"tri*um
Part of Speech : n.
Etymology : [NL., from Ytterby, in Sweden. See Erbium.] (Chem.)
Definition : Defn: 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 weight, 89. [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.
Source : Webster's Unabridged Dictionary, 1913