cephamycin
noun
ceph·a·my·cin
| \ ˌsef-ə-ˈmīs-ᵊn
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Medical Definition of cephamycin
: any of several beta-lactam antibiotics that are produced by various bacteria of the genus Streptomyces or are made semisynthetically and that closely resemble the cephalosporins in structure and pharmacological properties