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Any of several beta-lactamase enzymes that cleave the beta-lactam ring in penicillins. Penicillinases are found in many penicillin-resistant bacteria.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Medicine) any of a group of enzymes used to treat allergic reactions to penicillin
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||penicillinase - enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic|
enzyme - any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions
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