* Architrave - The decorative molding that outlines a door frame. (called an Archivolt if the door is arched). Called door casing or brickmold in North America.

* Bolt - A (nearly always) metal shaft usually internal to the door, attached by cleats or a specific form of bracket, that slides into the jamb to fasten a door.

* Battens - Smaller slats that extend horizontally across the door which the planks are affixed to. The battens hold the planks together. Sometimes a long diagonal slat or two are also implemented to prevent the door from skewing. On some doors, especially antique ones, the battens are replaced with iron bars that are often built into the hinges as extensions of the door-side plates. 

* Core material: Material within the door used simply to fill space, provide rigidity and reduce druminess.

* Core material: Material within the door used simply to fill space, provide rigidity and reduce druminess.

* Crash bar - A spring-loaded bar that is mounted horizontally on the side of the door that opens outward. When pushed upon, the bolt is released. This device is mandatory in most fire exits. Many of these doors are one-way, and cannot be opened from the outside.

* Crossbar, sometimes called a bolt (see below for modern use of this term) - A historically common, simple fastener consisting simply of a plank or beam mounted to one side of a door by a set of cleats.
* Door closer - A hydraulic device installed at the top of the door and employed to slow the door's closure behind someone.

*Doorknob - A knob or lever on an axle that is rotated to release the bolt.

* Door handle - A fixed handle, usually accompanied with a latch to release the bolt, on some doors (such as car doors) the latch is incorporated into a hinged handle that releases when pulled on. A handle set is composed of the exterior handle (including escutcheon), an independent deadbolt, and the interior package (knob or lever).

* Doorstop - a thin slat built inside the frame to prevent a door from swinging through when closed, which might break the hinges.

* Hollow-core - Often consists of a lattice or honeycomb made of corrugated cardboard, or thin wooden slats. Can also be built with staggered wooden blocks. Hollow-core flush doors are commonly used as interior doors. 

* Jambs - The vertical posts that form the sides of a door frame, where the hinges are mounted, and with which the bolt interacts.

* Latch - A device that allows one to fasten a door, but doesn't necessarily require an external handle

* Lintel - A horizontal beam above a door that supports the wall above it. (Also known as a header)

* Lock - A device that prevents access by those without a key or combination.

*Mullions - Smaller optional vertical boards that run between two rails, and split the door into two or more columns of panels, the term is used sometimes for verticals in doors, but more often (UK and Australia) it refers to verticals in windows.

* Muntin - Optional vertical members that divide the door into smaller panels.

* Panels - Large, wider boards used to fill the space between the stiles, rails, and mullions. The panels typically fit into grooves in the other pieces, and help to keep the door rigid. Panels may be flat, or in raised panel designs.

* Planks - Vertical boards that extend the full height of the door, and are placed side by side filling the door's width.

* Rails - Horizontal boards at the top, bottom, and optionally in the middle of a door that join the two stiles and split the door into two or more rows of panels. The "top rail" and "bottom rail" are named for their positions. The bottom rail is also known as "kick rail". A middle rail at the height of the bolt is known as the "lock rail", other middle rails are commonly known as "cross rails".

* Sill - A horizontal beam below the door that supports the frame

* Stiles - Vertical boards that run the full height of a door and compose its right and left edges. The hinges are mounted to the fixed side (known as the "hanging stile"), and the handle, lock, bolt, and/or latch are mounted on the swinging side (known as the "latch stile").