Definitions of muse:

• noun:   the source of an artist's inspiration

  Example: "Euterpe was his muse"

• noun:   in ancient Greek mythology any of 9 daughters of Zeus and Mnemosyne; protector of an art or science
• verb:   reflect deeply on a subject
• name:  A surname (common: 1 in 25000 families; popularity rank in the U.S.: #2950)