{ n. Also . [ Cathode + -graph. ] (Physics) A picture produced by the Roentgen rays; a radiograph. [ Webster 1913 Suppl. ]

n. [ Gr.&unr_; 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 ]

n. [ Gr. "odo`s way + -graph.] 1. A machine for registering the distance traversed by a vehicle or pedestrain. [Webster 1913 Suppl.]

2. A device for recording the length and rapidity of stride and the number of steps taken by a walker. [Webster 1913 Suppl.]