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Definitions of methacycline:
noun: (pharmacology) Alternative form of metacycline. [(pharmacology) A semisynthetic tetracycline antibiotic C₂₂H₂₂N₂O₈ with longer duration of action than most other tetracyclines used in the treatment of gonorrhea especially in penicillin-sensitive subjects and as a precursor in the industrial synthesis of doxycycline.]