Fischer n 1: German chemist noted for his synthesis of hemin (1881-1945) [syn: {Hans Fischer}] 2: German chemist noted for work on synthetic sugars and the purines (1852-1919) [syn: {Emil Hermann Fischer}] 3: United States chess master; world champion from 1972 to 1975 (born in 1943) [syn: {Bobby Fischer}, {Robert James Fischer}]