penicilloic acid
noun
pen·i·cil·lo·ic acid
| \ ˌpen-ə-sə-ˌlō-ik-
\
\
Medical Definition of penicilloic acid
: any of several acids having the general formula RCONH(C6H10NS)(COOH)2 which are obtained from the penicillins by hydrolytic opening of the lactam ring (as by the action of a beta-lactamase)