Noun
A cloaklike garment and hood woven in one piece, worn by Arabs.
A combination cloak and hood worn by women.
Source: Webster's dictionaryThe etymology of these names is unclear, perhaps deriving from tribal customs for clothing ("abtar" and "burnous"), or perhaps distinguishing the nomad (Butr) from the farmer (Baranis). Source: Internet
Singular of Baranis is Burnus, from which burnous, understoood as a long garment. Source: Internet