retropulsion

Noun

 * 1)  A tendency to step or walk backwards involuntarily, especially as a symptom of parkinsonism.
 * 2)  The pushing or forcing of something to move backwards or inwards.
 * 3)  Transfer of a disease from an external source to an internal organ.
 * 1)  The pushing or forcing of something to move backwards or inwards.
 * 2)  Transfer of a disease from an external source to an internal organ.
 * 1)  Transfer of a disease from an external source to an internal organ.
 * 1)  Transfer of a disease from an external source to an internal organ.
 * 1)  Transfer of a disease from an external source to an internal organ.
 * 1)  Transfer of a disease from an external source to an internal organ.
 * 1)  Transfer of a disease from an external source to an internal organ.