chloromycetin n an oral antibiotic (trade name Chloromycetin) used to treat serious infections (especially typhoid fever) Usage(s) She was assigned to the chloromycetin research project in 1947. A promising new weapon against tuberculosisan antibiotic called chloromycetinis reported in Science this week. It manufactures more cars, corn flakes and chloromycetin than any other state, commonwealth or country. Synonym(s) chloramphenicol Chloromycetin