iliotibial band

[ĭl′ē-ō-tĭbē-əl]
n.
  1. A fibrous reinforcement of the broad fascia on the lateral surface of the thigh, extending from the crest of the ilium to the lateral condyle of the tibia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.