'Whiplash injury' definitions:

Definition of 'whiplash injury'

(from WordNet)
noun
An injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident) [syn: whiplash, whiplash injury]

Definition of 'Whiplash injury'

From: GCIDE
  • Whiplash injury \Whip"lash` in"ju*ry\, n. an injury to the neck caused by the sudden motion of the head backward and forward, as occurs to the occupants of a vehicle hit from behind by another vehicle. [PJC]