Definition of: coif

(koif) noun
1. Any close–fitting cap, hood, or headdress; especially, a close–fitting hood or skull cap for either sex, tied under the chin.
2. In England, an inner skull cap of lawn, formerly worn by sergeants at law; hence, the office or rank of a sergeant at law.
3. A soldier's thick skull cap of steel or leather, worn under the helmet.
—v.t. To put a coif on; invest with or as with a coif. [<OF coife <LL cofia <Gmc.]