fossa
noun [ C ] medical specialized uk/ˈfɒs.ə/ us/ˈfɑːs.ə/ fossae
(拉丁语，用于医学术语中)凹;窝
a natural hollow, especially in a bone
The pituitary gland sits in a bony fossa called the sellar turcica. 脑下垂体位于被称为蝶鞍的骨窝处。
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