Definitions
1.nounThe crease or depression of the human body at the junction of the trunk and the thigh, together with the surrounding region.
2.nounThe area adjoining this fold or depression."He pulled a muscle in his groin."
3.nounThe projecting solid angle formed by the meeting of two vaults
4.nounThe genitals."He got kicked in the groin and was writhing in pain."
5.nounThe surface formed by two such vaults.
6.verbTo deliver a blow to the genitals of."In the scrum he somehow got groined."
7.verbTo build with groins.
8.verb(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)."