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Definition of RETROGRADE
a (1): having or being motion in a direction contrary to that of the general motion of similar bodies and especially east to west among the stars <Saturn is retrograde for another week>(2): having or being a direction of rotation or revolution that is clockwise as viewed from the north pole of the sky or a planet <a retrograde orbit>
b (1): moving, occurring, or performed in a backward direction (2): occurring or performed in a direction opposite to the normal or forward direction of conduction or flow — compare anterograde 1
: affecting memories of a period prior to a shock or seizure <retrograde amnesia>
: occurring or performed in a direction opposite to the normal or forward direction of conduction or flow: as a: occurring along nerve cell processes toward the cell body <retrograde axonal transport><retrograde degeneration of nerve fibers>b: occurring opposite to the normal direction or path of blood circulation <apply bandaging to the lower extremities to produce pressure to reduce retrograde blood flow in veins with incompetent valves>—compare anterograde 2