groin

Short definition from Wiktionary

Noun

1. 1
   The crease or depression of the human body at the junction of the trunk and the thigh, together with the surrounding region.
2. 2
   The area adjoining this fold or depression.
3. 3
   The projecting solid angle formed by the meeting of two vaults
4. 4
   The surface formed by two such vaults.
5. 5
   The genitals.
6. 6
   Alternative spelling of groyne.

Verb

1. 1
   To deliver a blow to the genitals of.
2. 2
   To build with groins.
3. 3
   To hollow out; to excavate.
4. 4
   To grunt; to growl; to snarl; to murmur.