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English definition of “fossa”

fossa

noun [C]     /ˈfɒs.ə/ US  /ˈfɑs.ə/ (plural fossae) specialized
a natural hollow, especially in a bone: The pituitary gland sits in a bony fossa called the sellar turcica.Substances and structures in the body
(Definition of fossa noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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