Uhthoff sign

[ōōthŏf]

n.

An indication of multiple sclerosis in which vasodilation from exposure to heat or from exertion may cause transient visual impairment or weakness.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.