noun

• The leader of an Arab village, family or small tribe.
• An Islamic religious cleric; the leader of an Islamic religious order.
• (some Arab Gulf countries) An official title for members of the royal family as well as some prominent families.
• (1920s) A romantic lover. (from the 1921 film The Sheik)
• (slang) An Arab, especially one dressed in traditional clothing.
• An honorific for specialists in spirituality, for example in Sufism.