lactam

noun
lac·tam | \ˈlak-ˌtam \

Medical Definition of lactam 

: any of a class of amides of amino carboxylic acids that are formed by the loss of a molecule of water from the amino and carboxyl groups, that are characterized by the carbonyl-imido group −CONH− in a ring, and that include many antibiotics — compare lactim, lactone

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