clavulanic acid

noun

clav·​u·​lan·​ic acid ˌklav-yə-ˌlan-ik- 

: 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