The bulb or handle on a door-lock spindle, by which the door is opened.(noun)
The Century Dictionary (Public Domain)
Use "door-knob" in a sentence
"On the chest of one hung a white door-knob, on the chest of another the handle of a china cup, on the chest of a third the brass cog-wheel of an alarm clock."
""It stinks," said Joe DiGregorio, 63, as he stood on his damp front porch here, a Toomey campaign door-knob brochure, crumpled up and soggy, stashed behind a stack of fire logs."
"He was brought back to himself by the rattle of the door-knob."