noun
groin
GROYN/ɡrɔɪn/
The area where the lower abdomen meets the upper thigh.
The athlete points to the crease at the groin.
Etymology
Old English grynde meant “abyss” and perhaps “hollow.” The later image of a depression in the ground was transferred to the crease between the abdomen and thigh.
In context
exercises to help strengthen your groin muscles, which are also called your hip adductors. They're the muscles on the inside of your thigh.