groin

noun

1. The crease or depression of the human body at the junction of the trunk and the thigh, together with the surrounding region.

   “The Mexican levelled nine minutes from time after Steven Gerrard, making his first start since undergoing groin surgery in April, put Liverpool ahead with a 68th-minute free-kick.”

2. The area adjoining this fold or depression.

   “He pulled a muscle in his groin.”

3. The projecting solid angle formed by the meeting of two vaults
4. The surface formed by two such vaults.
5. (euphemistic)The genitals.

   “He got kicked in the groin and was writhing in pain.”

   “My friend […] discovered in his early teen years a passion for both men and opera. He frequented the Met to satisfy his ear but had little knowledge or experience of where to find partners and satisfy his groin.”

6. (alt-of, alternative)Alternative spelling of groyne.

verb

1. To deliver a blow to the genitals of.

   “In the scrum he somehow got groined.”

   “She groined him and ran to the car.”

2. To build or furnish with a groin or groins.

   “The part of the village in which I resided was a grove of cocoa-nut trees, and at night, when the dead leaves were sometimes collected together and burnt, the effect was most magnificent - the tall stems, the fine crowns of foliage, and the immense fruit-clusters, being brilliantly illuminated against a dark sky, and appearing like a fairy palace supported on a hundred columns, and groined over with leafy arches.”

3. (literary, transitive)To hollow out; to excavate.

   “Down some profound dull tunnel, long since scooped / Through granites which titanic wars had groined.”

4. To grunt; to growl; to snarl; to murmur.

   “Such tunges ſhuld be torne out by the harde rootes,”

   “Beares, that groynd continually”