| 1. | Anatomy. the fold or hollow on either side of the front of the body where the thigh joins the abdomen. |
| 2. | the general region of this fold or hollow. |
| 3. | Architecture. the curved line or edge formed by the intersection of two vaults. |
| 4. | Also, groyne. a small jetty extending from a shore to prevent beach erosion. |
| 5. | Architecture. to form with groins. |
groin (groin)
n.
The crease or hollow at the junction of the inner part of each thigh with the trunk, together with the adjacent region and often including the external genitals.