Ismailite (n.) Look up Ismailite at Dictionary.com
also Ismaelite, 1570s, in reference to a Shi'ite Muslim sect, from Arabic Isma'iliy, the name of the sect that after 765 C.E. followed the Imamship through descendants of Ismail (Arabic for Ishmael), deceased eldest son of Jafar, the sixth Imam, rather than his surviving younger son.