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Definition of Ethmoid sinus
1. Noun. A sinus of the meatuses of the nasal cavity (behind the bridge of the nose).
Medical Definition of Ethmoid sinus
1. Numerous small thin-walled spaces or air cells in the ethmoid bone, where they form an ethmoidal labyrinth. (12 Dec 1998)
Lexicographical Neighbors of Ethmoid Sinus
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