Dictionary definition · groin
noun
- the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals
- a curved edge formed by two intersecting vaults
- a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
verb
- build with groins"The ceiling was groined"
Source: Open English WordNet (CC BY 4.0).