Definition of "Sun" :
noun: the star that is the source of light and heat for the planets in the solar system
"The sun contains 99.85% of the mass in the solar system."
noun: any star around which a planetary system revolves
noun: a person considered as a source of warmth or energy or glory etc
noun: the rays of the sun
"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 one's body to the sun
verb: expose to the rays of the sun or affect by exposure to the sun
"These herbs suffer when sunned."