noun
acetabulum; cotyloid cavity
Anatomical term for the hip socket. Used in medical and biological contexts.
大腿骨頭は寛骨臼にはまり込んでいる。
The femoral head fits into the acetabulum.
Compound of 寛骨 (hip bone) and 臼 (mortar, socket). The derivation is transparent from the kanji components.