frontal sinus

(redirected from Frontal air-sinus)
Also found in: Dictionary, Thesaurus, Medical.

frontal sinus

[¦frənt·əl ′sī·nəs]
(anatomy)
Either of a pair of air spaces within the frontal bone above the nasal bridge.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.