/ Thesaurus / O Synonyms of os sphenoidale Find synonyms for: Noun1. sphenoid bone, sphenoid, os sphenoidale, bone, osusage: butterfly-shaped bone at the base of the skullWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language