Pronunciation: (pu-ral'u-sis),[key] —n., —pl.-sesPronunciation: (-sēz").[key] 1. Pathol. a. a loss or impairment of voluntary movement in a body part, caused by injury or disease of the nerves, brain, or spinal cord.
b. a disease characterized by this, esp. palsy.
2. a state of helpless stoppage, inactivity, or inability to act: The strike caused a paralysis of all shipping.