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
References in periodicals archive ?
She her further knuckling down numeracy, literacy, aid safety confidence.
Rock chose to take last week off following the biggest win of his life but is now knuckling down to the task of putting himself on the world stage more often.
He said: "It is a case of knuckling down, working hard and hopefully I will get an opportunity again.
IN the race after Far Horizon's success, Mulligatawny provided further evidence that horses do come back to win after a setback when springing a 16-1 shock by knuckling down under Philip Hide to resist Sure Future in the 21/2-mile handicap hurdle.
John Woodcock will tell the party's Progress group too many Labour MPs have become "commentators" instead of "knuckling down".