noun
door
DOR/dɔːr/
An entrance and the barrier controlling access through it.
The blue door stands partly open, with its handle and hinges visible.

Etymology
The ancestor meant a door or gate, so the modern barrier preserves the old concrete meaning. Its history involves the merger of two Old English words for essentially the same thing.
In context
sometimes that effective barrier is not a door but a spiral like the spiral showers that people build where you don't have to have a door
More examples
- Please close the door before you leave.
- A delivery driver waits at the front door.
- Both doors lead into the kitchen.
- Maya works the door and checks tickets at concerts.
Forms
door · doors
doorway noun — An opening through which people enter or leave.
doorknob noun — A round handle for opening a door.