PEDAL (2)

pedal (2). Pedal, a. a foot high, belonging to a foot

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Pe″dal (pĕd″al), n. [[Cf. F. pédale, It. pedale. See Pedal, a.]] 1. 1. (Mech.) 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.
2. 2. (Geom.) A pedal curve or surface.