From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) The sun.

(2): ( n.) Apollo; the sun god.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]

( Φοῖβος , Bright), a title, and subsequently a name, of Apollo. It had reference both to the youthful beauty of the god, and to the radiance of the sun, when, latterly, Apollo became identified with Helios, the sun-god.

The Nuttall Encyclopedia [3]

E . the radiant one), an epithet originally applied to Apollo for his beauty, and eventually to him as the sun-god.