Source : Webster's Revised Unabridged Dictionary (1913)

Sheik \Sheik\, n. [Ar. sheikh, shaykh, a venerable old man, a
   chief, fr. sh[=a]kha to grow or be old.]
   The head of an Arab family, or of a clan or a tribe; also,
   the chief magistrate of an Arab village. The name is also
   applied to Mohammedan ecclesiastics of a high grade. [Written
   also {scheik}, {shaik}, {sheikh}.]

Source : WordNet®

sheik
     n 1: the leader of an Arab village or family [syn: {tribal sheik},
           {sheikh}, {tribal sheikh}, {Arab chief}]
     2: a man who is much concerned with his dress and appearance
        [syn: {dandy}, {dude}, {fop}, {gallant}, {beau}, {swell},
        {fashion plate}, {clotheshorse}]