/ Thesaurus / A Synonyms of atomic number 39 Find synonyms for: Noun1. yttrium, Y, atomic number 39, metallic element, metalusage: a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloysWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language