From BiblePortal Wikipedia

Webster's Dictionary [1]

(n.) The name of the Supreme Being, in use among the Arabs and the Mohammedans generally.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]

(contracted from the Arabic al ilah, "the God"), the usual name for God among the Mohammedans It is commonly used in connection with one or several of the 99 epithets or attributes of God.

(See Oak).