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ethmoidal sinus is a noun meaning "a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)". It carries one recorded sense.
a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
Definitions, synonyms and semantic relations for ethmoidal sinus come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.