Leri's sign

[lā-rēz]
n.
  1. An indication of hemiplegia in which the voluntary flexion of the elbow is impossible when the wrist on the paralyzed side is passively flexed.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.