1. Noun. Antibiotic related to cephalosporin but no longer in common use.
1. A cephalorsporin antibiotic. Pharmacological action: cephalosporins. Chemical name: 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-7-((aminophenylacetyl)amino)-8-oxo-, (6R-(6alpha,7beta(R*)))- (12 Dec 1998)