retropulsion

/R EH1 T R AH0 P AH1 L SH AH0 N/
noun
  1. 1

    (medicine) A tendency to step or walk backwards involuntarily, especially as a symptom of parkinsonism.

  2. 2

    (medicine) The pushing or forcing of something to move backwards or inwards.

  3. 3

    (medicine, obsolete) Transfer of a disease from an external source to an internal organ.