Florey, FLOHR ee, Lord (1898-1968), a British bacteriologist, helped develop with Ernst B. Chain the antibiotic penicillin (see Antibiotic; Penicillin). Alexander Fleming discovered penicillin in 1928. Florey shared the 1945 Nobel Prize in medicine with Fleming and Chain (see Fleming, Sir Alexander; Chain, Ernst Boris). In 1940 and 1941, Florey's research team at Oxford isolated penicillin in relatively pure form, and tested it.