Definition of groin

• n. - The snout of a swine.
• v. i. - To grunt to growl; to snarl; to murmur.
• n. - The line between the lower part of the abdomen and the thigh, or the region of this line; the inguen.
• n. - The projecting solid angle formed by the meeting of two vaults, growing more obtuse as it approaches the summit.
• n. - The surface formed by two such vaults.
• n. - A frame of woodwork across a beach to accumulate and retain shingle.
• v. t. - To fashion into groins; to build with groins.