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Ethmoid sinus
Pronunciation
Definition 1
A type of paranasal sinus (a hollow space in the bones around the nose). Ethmoid sinuses are found in the spongy ethmoid bone in the upper part of the nose between the eyes. They are lined with cells that make mucus to keep the nose from drying out. (NCI Dictionary)
Definition 2
A sinus of the meatuses of the nasal cavity. (NCI Thesaurus)
Definition 3
Numerous small thin-walled spaces or air cells in the ethmoid bone, where they form an ethmoidal labyrinth. (NLM, Medical Subject Headings)
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