Real Dictionary

pedal
countable noun: The pedals on a bicycle are the two parts that you push with your feet in order to make the bicycle move.
verb: When you pedal a bicycle, you push the pedals around with your feet to make it move.

pedal in American English
a lever operated by the foot, used in transmitting motion, as on a bicycle, or a pad pressed by the foot in activating a mechanism, as on a sewing machine, so as to operate a device
of or having to do with the foot or feet
to move or operate by a pedal or pedals; use the pedals (of)
noun: a foot-operated lever used to control certain mechanisms, as automobiles, or to play or modify the sounds of certain musical instruments, as pianos, organs, or harps

pedal in Automotive Engineering
noun: A pedal in a vehicle is a lever that you press with your foot in order to control the vehicle.

pedal in British English 1
noun: any foot-operated lever or other device, esp one of the two levers that drive the chain wheel of a bicycle, the foot brake, clutch control, or accelerator of a car, one of the levers on an organ controlling deep bass notes, or one of the levers on a piano
verb: to propel (a bicycle, boat, etc) by operating the pedals

pedal in British English 2
adjective: of or relating to the foot or feet