ethmoid sinus

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Related to ethmoidal cell: Posterior ethmoidal cells, Ethmoidal air cells
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Noun1.ethmoid sinus - a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
sinus - any of various air-filled cavities especially in the bones of the skull
References in periodicals archive ?
12] The bulla was found to be the most constant ethmoidal cell and the key area for approaching either the anterior or the posterior group of air cells.
Most involved the frontal sinus, although the maxillary sinus, ethmoidal cells, and sphenoidal sinus can also be affected.
According to Stammberger, they usually originate much more frequently in fissures and narrow spaces of the ethmoid than from ethmoidal cells themselves.