hereditary cerebellar ataxia

n.
  1. A disease of later childhood and early adult life marked by ataxic gait, hesitating and explosive speech, nystagmus, and sometimes optic neuritis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.