ethmoidal sinus
n.
Any of the evaginations of the mucous membrane of the middle and superior meatus of the nasal cavity, subdivided into anterior, middle, and posterior sinuses.
Words nearby ethmoidal sinus
ethmoidal artery,
ethmoidal cell,
ethmoidal crest,
ethmoidal foramen,
ethmoidal labyrinth,
ethmoidal sinus,
ethmoidal vein,
ethmoidectomy,
ethmoiditis,
ethmoturbinal,
ethnarch