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English definition of “knob”

knob

noun [C] (ROUND OBJECT)    /nɒb/ US  /nɑːb/
C1 a round handle , or a small round device for controlling a machine or electrical equipment : a brass door knob Turn / Twiddle the little knob to adjust the volume .Doors and parts of doorsElectrical switches and connections a round lump on the surface or end of somethingSpherical, circular and annular objectsGeometrical shapes
(Definition of knob noun (ROUND OBJECT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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