A class of antibiotic that has a monocyclic β-lactam nucleus and is structurally different from other β-lactams; e.g., aztreonam.

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mono·bac·tam .män-ō-'bak-tam n any of the class of beta-lactam antibiotics (as aztreonam) with a monocyclic ring structure

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mon·o·bac·tam (mon″o-bakґtam) a class of synthetic antibiotics having a monocyclic β-lactam nucleus.

Medical dictionary. 2011.

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