/ Thesaurus / A Synonyms of acorn cup Find synonyms for: Noun1. cupule, acorn cup, cupusage: cup-shaped structure of hardened bracts at the base of an acornWordNet 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