Dictionary.com
definitions

Langenbeck's triangle

[lăng′ən-bĕks′, läng′-]
n.
  1. A triangle formed by lines drawn from the superior iliac spine to the surface of the great trochanter and to the neck of the femur.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.