penicillinase

noun
pen·i·cil·lin·ase | \ˌpe-nə-ˈsi-lə-ˌnās, -ˌnāz\

Definition of penicillinase 

: beta-lactamase specifically : a beta-lactamase that hydrolyzes and inactivates penicillin

First Known Use of penicillinase

1940, in the meaning defined above

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The first known use of penicillinase was in 1940

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penicillinase

noun
pen·i·cil·lin·ase | \-ˈsil-ə-ˌnās, -ˌnāz \

Medical Definition of penicillinase 

: beta-lactamase specifically : a beta-lactamase that hydrolyzes and inactivates penicillin

More from Merriam-Webster on penicillinase

Britannica.com: Encyclopedia article about penicillinase

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