coif

Short definition from Wiktionary

Noun

1. 1
   A hairdo.
2. 2
   A hood; a close-fitting cap covering much of the head, widespread until the 18th century; after that worn only by small children and country women.
3. 3
   A similar item of mail armour covering the head.
4. 4
   An official headdress, such as that worn by certain judges in England.

Verb

1. 1
   To style or arrange hair.