Mufti \Muf"ti\, n.; pl. Muftis. [Ar. mufti.] An official expounder of Mohammedan law.
Source: Webster's Revised Unabridged Dictionary (1913)
Mufti \Muf"ti\, n. Citizen's dress when worn by a naval or military officer; -- a term derived from the British service in India. [Colloq. Eng.]