/ Thesaurus / P Synonyms of penicillinase Find synonyms for: Noun1. penicillinase, beta-lactamase, enzymeusage: enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibioticWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language