Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Middle Low German
Origin: knobbe

knob

 noun
     
knob [countable]
1D a round handle or thing that you turn to open a door, turn on a television etc:
He thought the door was locked, but he turned the knob and the door opened.
a brass door knob
I adjusted the volume knob and sat down.
2

a knob of something

a small piece of something [= lump]:
Melt a knob of butter in the pan.
3 British English spoken not polite a penis
4

with (brass) knobs on

British English spoken old-fashioned used especially by children to reply to an insult:
'You're fat and lazy.' 'Fat and lazy to you with brass knobs on!'
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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