noun
inner thigh; inside of the thigh
Refers to the inner part of the thigh, often in contexts of exercise, chafing, or body description.
スクワットで内ももを鍛える。
I train my inner thighs with squats.
夏は内ももが汗でかぶれやすい。
In summer, the inner thighs tend to get irritated from sweat.
Compound of 内 (うち, 'inside') and もも (腿, 'thigh'). The reading うちもも is straightforward.