koch

noun

1. Edward I.,1924–2013, U.S. politician: mayor of New York City 1977–89.
2. Ro·bert [roh-bert] /ˈroʊ bɛrt/, 1843–1910, German bacteriologist and physician: Nobel Prize 1905.

noun

1. Robert (ˈroːbɛrt). 1843–1910, German bacteriologist, who isolated the anthrax bacillus (1876), the tubercle bacillus (1882), and the cholera bacillus (1883): Nobel prize for physiology or medicine 1905

1. German bacteriologist who discovered the cholera bacillus and the bacterial cause of anthrax. He won a 1905 Nobel Prize for developing tuberculin.

1. German bacteriologist who demonstrated that specific diseases are caused by specific microorganisms. He identified the bacilli that cause anthrax, tuberculosis, and cholera, and he showed that fleas and rats are responsible for transmission of the bubonic plague and that the tsetse fly is responsible for transmitting sleeping sickness. Koch won the Nobel Prize for physiology or medicine in 1905.