beta-lactam

noun
be·ta-lac·tam
variants: or β-lactam \ˌbāt-ə-ˈlak-ˌtam, chiefly British ˌbē-tə- \

Medical Definition of beta-lactam 

: any of a large class of natural and semisynthetic antibiotics (as the penicillins and cephalosporins) with a lactam ring

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