door
UK[dɔː(r)]US[dɔːr]
n
A flat piece of wood, glass, or metal that you open and close to enter or leave a building, room, vehicle, or piece of furniture.
n
The space created when a door is open, or the entrance to a building or room.
Etymology
The word 'door' has a remarkably stable history, tracing directly back to the Proto-Germanic durz. This root itself descends from the Proto-Indo-European (PIE) root dhwer-, meaning 'doorway, gate, courtyard'. This ancient root is the prolific ancestor of a wide family of words related to openings and passages across Indo-European languages, including Latin foris (door) and Greek thura (door). The direct lineage from Old English duru or dor to the modern 'door' demonstrates a clear and unbroken semantic thread, preserving the core concept of a movable barrier at an entrance.
Analysis
The word 'door' is a simplex word of Germanic origin. It cannot be meaningfully segmented into smaller morphemes within modern English spelling.
Examples
Please close the door behind you.
He stood in the door and greeted everyone.
The new policy opened the door to further negotiations.