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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Yttrium \Yt"tri*um\, noun [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.
From WordNet (r) 2.0 [wn]:
yttrium
noun: a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys [syn: {Y}, {atomic number 39}]
From Elements database 20001107 [elements]:
yttrium Symbol: Y Atomic number: 39 Atomic weight: 88.905 Silvery-grey metallic element of group 3 on the periodic table. Found in uranium ores. The only natural isotope is Y-89, there are 14 other artificial isotopes. Chemically resembles the lanthanoids. Stable in the air below 400 degrees, celsius. Discovered in 1828 by Friedrich Wohler.
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