hip joint

noun
a ball-and-socket joint between the head of the femur and the innominate bone.

Origin:
1785–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hip joint
 
n
the ball-and-socket joint that connects each leg to the trunk of the body, in which the head of the femur articulates with the socket (acetabulum) of the pelvis

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

hip joint n.
The ball-and-socket joint formed by the head of the femur and the cup-shaped cavity of the hipbone. Also called coxa.

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

hip joint

in anatomy, the joint between the thighbone (femur) and the pelvis; also the area adjacent to this joint. The hip joint is a ball-and-socket joint; the round head of the femur rests in a cavity (the acetabulum) that allows free rotation of the limb. Amphibians and reptiles have relatively weak pelvic girdles, and the femur extends horizontally. This does not permit efficient resistance to gravity, and the trunks of these animals often rest partially on the ground. In mammals the hip joint allows the femur to drop vertically, thus permitting the animal to hold itself off the ground and leading to specializations for running and leaping. See also pelvic girdle.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Hip joint replacement is surgery to replace all or part of the hip joint with an artificial joint.
Hip pain involves any pain in or around the hip joint.
It involves scraping the surfaces of the hip joint and femur and placing a metal cap over the bone.
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