Meaning of hodograph

hod•o•graph

Pronunciation: (hod'u-graf", -gräf"), [key]
— n. Math., Mech.
  1. the figure described by the extremity of a vector that has a fixed origin and a position vector equal to the velocity of a moving particle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.