1
- the area between the abdomen and the thigh on either side of the body腹股沟。
1.1
- informal the region of the genitals〈非正式〉阴部, 私处：
he took a pace back and kicked him in the groin.
他后退一步踢中了他的下身。
2
- Architecture a curved edge formed by two intersecting vaults【建筑】（交叉）穹棱; 穹棱肋。
词源
late Middle English grynde, perhaps from Old English grynde 'depression， abyss'.