knob
//nɒb//
Noun
knobSingular
knobsPlural
1
A rounded handle on a door or drawer that is turned or pulled to open it.
She turned the knob and opened the door.
2
A rounded control switch or dial on a machine or device.
Turn the knob to adjust the volume.
3
A rounded lump or ball, especially at the end or on the surface of something.
The walking stick has a decorative knob at the top.
4
A small lump of a substance, such as butter.
She added a knob of butter to the pan.