Coat of mail is a type of armor that was used in the Middle Ages. It is composed of small metal rings that are linked together to form a protective layer. The term 'coat of mail' is often used interchangeably with HAUBERK, which is a 7-letter word meaning a long shirt of mail reaching to the knees or lower. Habergeon is a 9-letter word meaning a short coat of mail reaching only to the waist. ARMOUR is a 6-letter word meaning any protective covering worn in battle.