Pedal curve
Pedal Pe"dal, 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 (Zo["o]l.), pertaining to the foot of a mollusk; as, the pedal ganglion. [1913 Webster]

2. 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]

The Collaborative International Dictionary of English. 2000.

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• Pedal curve — Geometric construction of the pedal of C with respect to P In the differential geometry of curves, a pedal curve is a curve derived by construction from a given curve (as is, for example, the involute). Let C be a given curve and P a fixed point… …   Wikipedia

• Negative pedal curve — Circle negative pedal curve of a limaçon In the plane, for every point X other than P there is a unique line through X perpendicular to XP. For a given curve in the plane and a given fixed point P, called the pedal point, the negative pedal curve …   Wikipedia

• Pedal — Pe dal, 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 (Zo[ o]l.), pertaining to the foot of a mollusk; as, the pedal ganglion. [1913 Webster] …   The Collaborative International Dictionary of English

• Pedal note — Pedal Pe dal, 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 (Zo[ o]l.), pertaining to the foot of a mollusk; as, the pedal ganglion. [1913… …   The Collaborative International Dictionary of English

• Pedal organ — Pedal Pe dal, 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 (Zo[ o]l.), pertaining to the foot of a mollusk; as, the pedal ganglion. [1913… …   The Collaborative International Dictionary of English

• Pedal surface — Pedal Pe dal, 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 (Zo[ o]l.), pertaining to the foot of a mollusk; as, the pedal ganglion. [1913… …   The Collaborative International Dictionary of English

• Pedal — Pe dal, n. [Cf. F. p[ e]dale, 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… …   The Collaborative International Dictionary of English

• Pedal — Distinguish from paddle and petal and the verb peddle.The word pedal comes from the Latin (, Pedis) and relates to the foot.A pedal is a lever activated by one s foot. Examples include:* Automobile pedal * Bicycle pedal * Pedalo, a small boat,… …   Wikipedia

• Pedal point — For pedal point in the mathematical sense, see pedal curve. For the pedal concept in brass instruments, see pedal tone. Pedal tone example.[1] …   Wikipedia

• Pedal harp — Harp Classification String instrument (plucked) Playing range …   Wikipedia