/ Thesaurus / P Synonyms of proprietary drug Find synonyms for: Noun1. brand-name drug, proprietary drug, drugusage: a drug that has a trade name and is protected by a patent (can be produced and sold only by the company holding the patent)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language