Dictionary entry

Hodograph

Webster's Dictionary 1913

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.