n :  a semisynthetic penicillin C₂₁H₂₂N₂O₅S that is resistant to beta-lactamase and is used esp. in the form of its sodium salt as an antibiotic .
 
 
 
Similar sounding terms:  na·phaz·o·line 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.