from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A knob-shaped handle for opening and closing a door.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A circular device attached to a door, the rotation of which permits the unlatching of the door.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a knob used to release the catch when opening a door (often called `doorhandle' in Great Britain)
From door + knob. (Wiktionary)