sphenoidal sinus
n.
Either of a pair of cavities in the body of the sphenoid bone that communicate with the nasal cavity.
Words nearby sphenoidal sinus
sphenogram,
sphenography,
sphenoid,
sphenoid bone,
sphenoid crest,
sphenoidal sinus,
sphenoidal spine,
sphenoiditis,
sphenoidotomy,
sphenopalatine artery,
sphenopalatine foramen