tetracycline tetracyclic • tetrad · · · Info · Definitions · Synonyms · Characters · · tetracycline · · Text Latin · · Script 12 · · Length 4 · · Syllables Definitions · · · (noun) an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections. Synonyms: Achromycin. · · Noun Definition 1 Synonyms · · · achromycin · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079