fatimite

from The Century Dictionary.

• Descended from Fatima, the daughter of Mohammed, and wife of the calif Ali.
• noun One of the members of an Arabian dynasty descended from Ali and Fatima, and ruling from 909 to 1171 in northern Africa and for a large part of that period in Egypt and Syria. One of the earlier rulers assumed the title of calif.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Hist.) Descended from Fatima, the daughter and only child of Mohammed.