Definition of amoxicillin in English:


(also amoxycillin)


  • A broad-spectrum semisynthetic penicillin, closely related to ampicillin but better absorbed when taken orally, used especially for ear and upper respiratory infections.

    • ‘For urinary tract infection, we examined resistance to ampicillin or amoxicillin and trimethoprim.’
    • ‘Most of the medicines were antibiotics, such as amoxycillin and ampicillin.’
    • ‘Otherwise, amoxicillin and ampicillin have almost the same spectrum of antimicrobial activity.’
    • ‘The curative treatment recommended for endocarditis combines penicillin or amoxicillin with gentamicin.’
    • ‘If you are given treatment for a bacterial infection with the antibiotics ampicillin or amoxycillin, you may develop a rash of small red spots.’


Late 20th century: blend of amino + contractions of hydroxy- + penicillin.