Jinnee

Jin′nee (jĭn′nē), n.; pl. Jinn (jĭn). [Ar.] (Arabian & Mohammedan Myth.) A genius or demon; one of the fabled genii, good and evil spirits, supposed to be the children of fire, and to have the power of assuming various forms. [Written also jin, djinnee, etc.]

☞ Jinn is also used as sing., with pl. jinns.