ampicillin


am·pi·cil·lin

noun \ˌam-pə-ˈsil-ən\

Definition of AMPICILLIN

: a penicillin C16H19N3O4S that is effective against gram-negative and gram-positive bacteria and is used in anhydrous forms, as the trihydrate, or as the sodium salt to treat various infections of the urinary, respiratory, and intestinal tracts—see penbritin

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