groin

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

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

5. The surface formed by two such vaults.

1. To deliver a blow to the genitals of.

   In the scrum he somehow got groined.

2. To build with groins.
3. (literary) To hollow out, to excavate.

   'Down some profound dull tunnel, long since scooped / Through granites which titanic wars had groined.' (From Strange Meeting by Wilfred Owen).

verb

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

noun

An often wooden structure that projects from a coastline to prevent erosion, longshore drift etc.; a breakwater.