Definition of ampicillin in English:
 ampicillin
nounˌampɪˈsɪlɪnˌampəˈsilin
mass nounMedicine A semi-synthetic form of penicillin used to treat infections of the urinary and respiratory tracts.
 Example sentencesExamples
-  The patients had been treated with ampicillin, penicillin, or chloramphenicol.
 -  A pink rash can occur all over the body in children who have been treated with ampicillin or amoxicillin.
 -  The liver is also actively involved in detoxifying and excreting into the bile many different drugs, including sulfonamides, penicillin, ampicillin and erythromycin to name a few.
 -  If you are given treatment for a bacterial infection with the antibiotics ampicillin or amoxycillin, you may develop a rash of small red spots.
 -  For urinary tract infection, we examined resistance to ampicillin or amoxicillin and trimethoprim.
 
Origin
  
1960s: blend of amino and a contraction of penicillin.