Shia
Concise Oxford English Dictionary © 2008 Oxford University Press:
Shia /ˈʃɪə/ (also Shi'a)
▶noun (pl. same or Shias) one of the two main branches of Islam, regarding Ali, the fourth caliph, as Muhammad's first true successor. Compare with Sunni.
■ a Muslim who adheres to this branch of Islam.
– origin from Arab. šī‘a ‘party (of Ali)’.
'Shia' also found in these Oxford entries:

