Definitions of Watson:

• noun:   United States geneticist who (with Crick in 1953) helped discover the helical structure of DNA (born in 1928)
• noun:   United States psychologist considered the founder of behavioristic psychology (1878-1958)
• noun:   United States telephone engineer who assisted Alexander Graham Bell in his experiments (1854-1934)
• name:  A surname (very common: 1 in 970 families; popularity rank in the U.S.: #72)