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groin

[groin]
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noun
  1. Anatomy. the fold or hollow on either side of the front of the body where the thigh joins the abdomen.
  2. the general region of this fold or hollow.
  3. Architecture. the curved line or edge formed by the intersection of two vaults.
  4. Also groyne. a small jetty extending from a shore to prevent beach erosion.
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verb (used with object)
  1. Architecture. to form with groins.
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Origin of groin

1350–1400; earlier grine, Middle English grinde; compare Old English grynde abyss, akin to grund bottom, ground1
Related formsun·groined, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for groin

groin

noun
  1. the depression or fold where the legs join the abdomenRelated adjective: 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
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verb
  1. (tr) architect to provide or construct with groins
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Word Origin

C15: perhaps from English grynde abyss; related to ground 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for groin

n.

1590s, earlier grine (1530s), from Middle English grynde "groin" (c.1400), originally "depression in the ground," from Old English grynde "abyss," perhaps also "depression, hollow," from Proto-Germanic *grundus (see ground). Altered 16c. by influence of loin or obsolete groin "snout." The architectural groin "edge formed by the intersection of two vaults" is from 1725.

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Online Etymology Dictionary, © 2010 Douglas Harper

groin in Medicine

groin

(groin)
n.
  1. 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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.