groin

Noun

• a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away

• a curved edge formed by two intersecting vaults

• 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

Verb

• build with groins
  • The ceiling was groined
    

Related words

• Synonyms: 
  breakwater , groyne , mole , bulwark , seawall , jetty , inguen