groin

American  

[groin] / grɔɪn /

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.

groin British  

/ ɡrɔɪn /

noun

1. the depression or fold where the legs join the abdomen

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

Other Word Forms

• ungroined
  adjective

Etymology

Origin of groin

1350–1400; earlier grine, Middle English grinde; compare Old English grynde “abyss,” akin to grund “bottom, ground ¹ ”

Example Sentences

First, doctors make a small puncture in an artery, usually in the groin, and feed a catheter up into the patient’s heart.

From The Wall Street Journal • Apr. 24, 2026

Wallick wears a helmet and a cup when he goes water skiing, after once taking a hit to the groin that knocked him off his skis.

From The Wall Street Journal • Apr. 8, 2026

The 23-year-old has returned to the England fold for the first time since last summer having missed the September, October and November camps because of a groin injury.

From BBC • Mar. 26, 2026

Since then, Jorgensen has suffered a groin issue, prompting Sanchez's return and resulting in five goalkeeper changes across six matches.

From BBC • Mar. 20, 2026

There was fungus, too, issuing out of the cracks, and in the groin of a branch, in weird, spongy shapes.

From "I'm the King of the Castle" by Susan Hill