penicillinase penicillin • penicillinase-resistant antibiotic · · · Info · Definitions · Synonyms · Characters · · penicillinase · · Text Latin · · Script 13 · · Length 5 · · Syllables Definitions · · · (noun) enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic. Synonyms: beta-lactamase. · · Noun Definition 1 Synonyms · · · beta-lactamase · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 s latin small letter s U+0073