/ Thesaurus / A Synonyms of arm bone Find synonyms for: Noun1. arm bone, long bone, os longumusage: a bone in the armWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language