Anatomy. the fold or hollow on either side of the front of the body where the thigh joins the abdomen.
the general region of this fold or hollow.
Architecture. the curved line or edge formed by the intersection of two vaults. See illus. under vault1.
Also, groyne. a small jetty extending from a shore to prevent beach erosion.
verb (used with object)
Architecture. to form with groins.

1350–1400; earlier grine, Middle English grinde; compare Old English grynde abyss, akin to grund bottom, ground1

ungroined, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
groin (ɡrɔɪn)
1.  the depression or fold where the legs join the abdomenRelated: inguinal
2.  euphemistic the genitals, esp the testicles
3.  a variant spelling (esp US) of groyne
4.  architect a curved arris formed where two intersecting vaults meet
5.  (tr) architect to provide or construct with groins
Related: inguinal
[C15: perhaps from English grynde abyss; related to ground1]

groyne or esp (US) groin (ɡrɔɪn)
spur, Also called: breakwater a wall or jetty built out from a riverbank or seashore to control erosion
[C16: origin uncertain: perhaps altered from groin]
groin or esp (US) groin
[C16: origin uncertain: perhaps altered from groin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1592, from M.E. grynde "groin" (c.1400), originally "depression in the ground," from O.E. grynde "abyss," perhaps also "depression, hollow," from P.Gmc. *grundus (see ground). Altered 16c. by influence of loin. The architectural groin "edge formed by the intersection of two vaults" is from 1725.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

groin (groin)
The crease or hollow at the junction of the inner part of each thigh with the trunk, together with the adjacent region and often including the external genitals.

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