WordNet (r) 3.0 (2006):

Marx
    n 1: United States comedian; one of four brothers who made
         motion pictures together (1901-1979) [syn: Marx, Herbert
         Marx, Zeppo]
    2: United States comedian; one of four brothers who made motion
       pictures together (1893-1964) [syn: Marx, Arthur Marx,
       Harpo]
    3: United States comedian; one of four brothers who made motion
       pictures together (1891-1961) [syn: Marx, Leonard Marx,
       Chico]
    4: United States comedian; one of four brothers who made motion
       pictures together (1890-1977) [syn: Marx, Julius Marx,
       Groucho]
    5: founder of modern communism; wrote the Communist Manifesto
       with Engels in 1848; wrote Das Kapital in 1867 (1818-1883)
       [syn: Marx, Karl Marx]