Pronunciation: (koif),[key] —n. 1. a hood-shaped cap, usually of white cloth and with extended sides, worn beneath a veil, as by nuns.
2. any of various hoodlike caps, varying through the centuries in shape and purpose, worn by men and women.
3. a cap similar to a skullcap, formerly worn by sergeants at law.
4. Armor.a covering for the head and neck, made of leather, padded cloth, or mail.
5. Brit.the rank or position of a sergeant at law.