A knob-shaped handle for opening and closing a door.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "doorknob" in a sentence
"It's simple for a thief to break glass panels and then reach in and open a doorknob from the inside."
"Keep it sad around here for Tommy’s sake, he said, and went back to the lobby, where he pulled the doorknob from the wall."
"The doorknob is the homeowner’s property, and pulling particles from that property seizes those particles."