Source : Webster's Revised Unabridged Dictionary (1913)

Mufti \Muf"ti\, n.; pl. {Muftis}. [Ar. mufti.]
   An official expounder of Mohammedan law.

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.]

Source : WordNet®

mufti
     n 1: a jurist who interprets Muslim religious law
     2: civilian dress worn by a person who is entitled to wear a
        military uniform