mufti

from The Century Dictionary.

• noun A Mohammedan law-officer whose duty it was to expound the law which the kadi was to execute.
• noun In India, citizen's dress worn by officers when off duty: now commonly used in this sense in the British army.

from the GNU version of the Collaborative International Dictionary of English.

• noun Colloq. Eng. Ordinary civilian dress when worn by persons who serve in a uniformed service, such as the military or police. It originally was used in reference to British naval or military officers, and originated with the British service in India.
• noun An official expounder of Mohammedan law.
• noun One of the chief legal advisers to the Sultan of the Ottoman Empire.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun countable (Islam) A Muslim scholar and interpreter of shari’a law, who can deliver a fatwa
• noun uncountable (UK, New Zealand) Civilian dress when worn by a member of the military, or casual dress when worn by a pupil of a school who normally would wear uniform

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a jurist who interprets Muslim religious law
• noun civilian dress worn by a person who is entitled to wear a military uniform