Main Entry:

am·pi·cil·lin

Pronunciation:

\ˌam-pə-ˈsi-lən\

Function:

noun

Etymology:

amino + penicillin

Date:

1961

: a penicillin C₁₆H₁₉N₃O₄S that is effective against gram-negative and gram-positive bacteria and is used to treat various infections of the urinary, respiratory, and intestinal tracts