| Landsteiner (lānd'stī'nər) Pronunciation Key
Austrian-born American pathologist who discovered the human blood groups A, B, and O in 1901. In 1902, his colleagues discovered a fourth group, AB, and in 1927 Landsteiner discovered two more groups, M and N. For this work Landsteiner received the 1930 Nobel Prize for physiology or medicine. In 1940 he discovered the Rh factor. |