treadle

A pedal or lever operated by the foot for circular drive, as in a potter’s wheel or sewing machine.

To work a treadle.

To operate a treadle; specifically, in playing a reed-organ, to operate the feeders by means of the foot-levers or pedals.

A lever designed to be moved by the foot to impart motion to a machine, as a lathe, sewing-machine, or bicycle.

The tough ropy or stringy part of the white of an egg; the chalaza: so called because formerly supposed to be the male sperm. Compare tread, 4.

The part of a foot lathe, or other machine, which is pressed or moved by the foot.

The chalaza of a bird’s egg; the tread.

A foot–operated pedal or lever that generates circular motion.

To use a treadle.

a lever that is operated with the foot