GROIN, noun 1. The depressed part of the human body between the belly and the thigh. 2. Among builders, the angular curve made by the intersection of two semi-cylinders or arches. 3. The snout or nose of a swine. GROIN, verb intransitive To groan.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI