Hypertext Webster Gateway: "Yttrium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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 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.
From WordNet (r) 1.7 (wn)
yttrium
n : a silvery metallic element that is common in rare-earth
minerals; used in magnesium and aluminum alloys [syn: {Y},
{atomic number 39}]
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