WordNet (r) 3.0 (2006):

Clark
    n 1: United States explorer who (with Meriwether Lewis) led an
         expedition from St. Louis to the mouth of the Columbia
         River; Clark was responsible for making maps of the area
         (1770-1838) [syn: Clark, William Clark]
    2: United States general who was Allied commander in Africa and
       Italy in World War II and was commander of the United Nations
       forces in Korea (1896-1984) [syn: Clark, Mark Clark,
       Mark Wayne Clark]
    3: United States psychologist (born in Panama) whose research
       persuaded the Supreme Court that segregated schools were
       discriminatory (1914-2005) [syn: Clark, Kenneth Clark,
       Kenneth Bancroft Clark]
    4: Canadian politician who served as prime minister (1939-)
       [syn: Clark, Joe Clark, Charles Joseph Clark]