leaf (n) - 

1. A hinged part; a separately movable division of a folding or sliding door.

2. One of a pair of doors or windows.

McGraw-Hill Dictionary of Architecture and Construction


backseat (n) - 

1. The distance from the edge of the door, to the center of the bore hole in the door

Door Hardware Institute

cylinder (n) - 

1. A mechanism housed within door locks that contains the tumbler and keyway, into which a key is inserted to operate the lock.

Homestead Commercial Door Glossary

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"The door is the handshake of the building"
Juhani Pallasmaa