chlortetracycline Syllabification: (chlor·tet·ra·cy·cline)Pronunciation: /ˌklôrˌtetrəˈsīˌklēn/Definition of chlortetracycline noun Medicine an antibiotic of the tetracycline group, active against many bacterial and fungal infections. This antibiotic is obtained from the bacterium Streptomyces aureofaciens or produced synthetically chlortetracycline in other Oxford dictionaries Definition of chlortetracycline in the British & World English dictionary