rotational nystagmus

[rō-tāshə-nəl]
n.
  1. A jerky nystagmus arising from stimulation of the labyrinth of the ear by rotation of the head around any axis and induced by change of motion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.