/ Thesaurus / P Synonyms of penicillin v Find synonyms for: Noun1. penicillin V, phenoxymethyl penicillin, penicillinusage: a crystalline penicillin similar in action to penicillin G but more resistant to the action of gastric acidsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language