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Medical Definition of Ethmoid air cells
1. The numerous small air-filled cells of the ethmoidal labyrinth. See: anterior ethmoidal air cells, middle ethmoidal air cells, posterior ethmoidal air cells. Synonym: cellulae ethmoidales, sinus ethmoidales, ethmoidal cells. (05 Mar 2000)
Lexicographical Neighbors of Ethmoid Air Cells
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