nounpl. Zaidi or Zai·dis
A member of any of various branches of Shiism, concentrated mainly in the southern Arabian Peninsula, that accept the authority though not the infallibility of living imams as temporal and spiritual successors to Muhammad.
Origin of ZaidiArabic zayd&imacron;, after Zayd, ibn Ali (died 740), whom Zaidis recognize as the fifth imam, in contrast to Twelver Shiites, who recognize his brother Muhammad ibn Ali al-Baqir (676–c. 743) as the fifth imam.