groin

Noun
  1. 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 (synset 105605489)
  2. A curved edge formed by two intersecting vaults (synset 103466715)
  3. A protective structure of stone or concrete;
    Extends from shore into the water to prevent a beach from washing away (synset 102897867)
Verb
  1. Build with groins (synset 201659650)
    "The ceiling was groined"

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