pedal

a. [ L. pedalis, fr. pes, pedis, foot. See Foot, and cf. Pew. ] 1. 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. [ 1913 Webster ]

2. def>Of or pertaining to a pedal; having pedals. [ 1913 Webster ]

Pedal curve or
Pedal surface (Geom.), the curve or surface which is the locus of the feet of perpendiculars let fall from a fixed point upon the straight lines tangent to a given curve, or upon the planes tangent to a given surface. --
Pedal note (Mus.), the note which is held or sustained through an organ point. See Organ point, under Organ. --
Pedal organ (Mus.), an organ which has pedals or a range of keys moved by the feet; that portion of a full organ which is played with the feet. [ 1913 Webster ]

n. [ Cf. F. pédale, It. pedale. See Pedal, a. ] 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. [ 1913 Webster ]

2. (Geom.) A pedal curve or surface. [ 1913 Webster ]

n. a person who rides a pedal-driven vehicle.
Syn. -- pedaller. [ WordNet 1.5 ]

a. Relating to the foot, or to a metrical foot; pedal. [ R. ] Maunder. [ 1913 Webster ]

n. The act of measuring by paces. [ R. ] Ash. [ 1913 Webster ]