ta·zo·bac·tam 
(tā′zō-băktăm)
(tā′zō-băktăm)n.
A compound, C10H12N4O5S, that inhibits action of the enzyme beta-lactamase, thus counteracting bacterial resistance to beta-lactam antibiotics. It is used in its sodium form in combination with piperacillin to treat infections caused by antibiotic-resistant bacteria.
[Probably T(RI)- + AZO- + -bactam, suffix for inhibitors of beta-lactamase, bacterial enzyme conferring resistance to certain antibiotics (B(ETA)- + LACTAMASE).]