Read the dictionary definition of groin. All definitions for this word.
1. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
2. a curved edge formed by two intersecting vaults
3. 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
4. build with groins
1. The ceiling was groined
