A star that is the center of a planetary system, The central body of the solar system, around which the earth and other planets revolve, retained in their orbits by its attraction, and supplied with energy by its radiance, The luminary or orb which constitutes the center of any system of worlds_ as, the fixed stars may be suns in their respective systems, verb_ expose to the rays of the sun or affect by exposure to the sun, expose one's body to the sun, transitive verb_ To expose to the sun's rays; to warm or dry in the sun, intransitive verb_ To expose to the sun's rays, as for warming, drying, or tanning, To expose oneself or itself to the sun