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Definition of Sinus ethmoidales
1. Noun. A sinus of the meatuses of the nasal cavity (behind the bridge of the nose).
Medical Definition of Sinus ethmoidales
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)