Also found in: Dictionary, Thesaurus, Financial, Encyclopedia, Wikipedia.
a deep, narrow groove in the lateral wall of the middle meatus of the nasal cavity, into which the maxillary sinus, the frontonasal duct, and the middle ethmoid cells open.
Farlex Partner Medical Dictionary © Farlex 2012
The groove in the external wall of the middle meatus of the nasal fossa into which the frontal sinus, maxillary sinus, and anterior ethmoid sinuses drain. The opening may be blocked in patients with acute or chronic sinusitis.
See also: hiatus
Medical Dictionary, © 2009 Farlex and Partners