Definition of pedal

• a. - Of or pertaining to the foot, or to feet, literally or figuratively; specifically (Zool.), pertaining to the foot of a mollusk; as, the pedal ganglion.
• a. - Of or pertaining to a pedal; having pedals.
• a. - A lever or key acted on by the foot, as in the pianoforte to raise the dampers, or in the organ to open and close certain pipes; a treadle, as in a lathe or a bicycle.
• a. - A pedal curve or surface.