fossa Definition in the Cambridge English Dictionary
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fossanoun [C]

uk   /ˈfɒs.ə/  us   /ˈfɑs.ə/ (plural fossae ) specialized
a ​naturalhollow, ​especially in a ​bone: The ​pituitaryglandsits in a ​bony fossa called the sellar turcica.
(Definition of fossa from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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