a short chain with a removable slide fitting that can be attached between the inside of a door and the doorjamb to prevent the door from being opened more than a few inches without the chain being removed.
[ 1830-40 ]
DOOR CHAIN
Meaning of DOOR CHAIN in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012