Definitions of sun:

• noun:   a typical star that is the source of light and heat for the planets in the solar system

  Example: "The sun contains 99.85% of the mass in the solar system"

• noun:   any star around which a planetary system evolves
• noun:   a person considered as a source of warmth or energy or glory etc
• noun:   the rays of the sun

  Example: "The shingles were weathered by the sun and wind"

• noun:   first day of the week; observed as a day of rest and worship by most Christians
• verb:   expose to the rays of the sun or affect by exposure to the sun

  Example: "These herbs suffer when sunned"

• verb:   expose one's body to the sun
• name:  A female given name (rare: 1 in 14285 females; popularity rank in the U.S.: #1056)
• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #4349)