yttrium

noun

1. a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys

   noun.substance

   Synonyms atomic number 39 y

   Source: WordNet 3.0

2. 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.

   noun

   Source: webster1913