Hodograph

Hod"o*graph

(?), n. [Gr. path + graph.] (Math.) A curve described by the moving extremity of a line the other end of which is fixed, this line being constantly parallel to the direction of motion of, and having its length constantly proportional to the velocity of, a point moving in any path; -used in investigations respecting central forces.
[1913 Webster]

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Wed 22nd May 2013