Definition of ampicillin noun from the Oxford Advanced Learner's Dictionary

 

ampicillin

 noun
noun
BrE BrE//ˌæmpɪˈsɪlɪn//
 
; NAmE NAmE//ˌæmpɪˈsɪlɪn//
 
[uncountable]
 
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a form of penicillin that is used to treat certain infections Word Origin 1960s: blend of amino and a contraction of penicillin.
See the Oxford Advanced American Dictionary entry: ampicillin