/ Thesaurus / A Synonyms of atomic number 64 Find synonyms for: Noun1. gadolinium, Gd, atomic number 64, metallic element, metalusage: a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth groupWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: leonine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language