Medical Definition of clavulanic acid
: a beta-lactam antibiotic C8H9NO5 produced by a bacterium of the genus Streptomyces (S. clavuligerus) that is a beta-lactamase inhibitor and is usually used in the form of its clavulanate salt of potassium especially in combination with amoxicillin — see augmentin
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Merriam-Webster unabridged
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