beta-lactamase[bāˌtə-lăkˈtə-māsˌ, -māzˌ, bēˌ-]
beta-lactamase definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Origin: beta-lactam, cyclic amide occurring in penicillins (beta + lact(one) + am(ide)) + -ase.
beta-lactamase - Medical Definition
Any of various enzymes that are produced by gram-negative bacteria and hydrolyze lactam rings, thereby inactivating penicillin and cephalosporin antibiotics. Also called cephalosporinase, penicillinase.