Origin: 1830–40; < Ar ismāʿīlī (equiv. to Ismāʿīl (died a.d. 760), elder son of the imam Jaʿfar, but disinherited by his father + -ī suffix of appurtenance) + -an
Is·ma·i·li (ĭs'mä-ē'lē) n.
pl.Is·ma·i·lis also Is·ma·i·li·ans A member of a branch of Shiism that follows a living imam and is noted for esoteric philosophy.
[Arabic Isma'īlīy, after Isma'īl (died 760), son of the sixth imam, Jafar (700?-765).]