knuckle

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knuckle

 [nuk´'l]
the dorsal aspect of any interphalangeal joint, or any similarly bent structure.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

knuck·le

(nŭk'ĕl),
1. A joint of a finger when the fist is closed, especially a metacarpophalangeal joint.
2. A kink or loop of intestine, as in a hernia.
[M.E. knokel]
Farlex Partner Medical Dictionary © Farlex 2012

knuckle

(nŭk′əl)
n.
a. The prominence of the dorsal aspect of a joint of a finger, especially of one of the joints connecting the fingers to the hand.
b. A rounded protuberance formed by the bones in a joint.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

knuck·le

(nŭk'ĕl)
1. A joint of a finger when the fist is closed, especially a metacarpophalangeal joint.
2. A kink or loop of intestine, as in a hernia.
[M.E. knokel]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

knuckle

The common name for a finger joint.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005