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From The Collaborative International Dictionary of English v.0.48:
Whiplash \Whip"lash`\, n. 1. The lash of a whip, -- usually made of thongs of leather, or of cords, braided or twisted. [1913 Webster] 2. a sudden change of direction, resembling the motion of the tip of a whip when it is cracked. [PJC] 3. a stinging psychological effect reminiscent of being stung by a whip. [PJC] 4. a whiplash injury. [PJC]