Medical Definition of retrograde
1: characterized by retrogression
2: affecting memories of a period prior to a precipitating event (as brain injury or disease) <In retrograde amnesia, the victim can remember only what has happened since he lost his memory; everything before that is irretrievable.—Jean Seligmann, Newsweek, 29 Sept. 1986>—compare anterograde 1
3: occurring or performed in a direction opposite to the normal or forward direction of conduction or flow: asa: 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
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