/ Thesaurus / O Synonyms of os longum Find synonyms for: Noun1. long bone, os longum, bone, osusage: in limbs of vertebrate animals: a long cylindrical bone that contains marrowWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language