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frontal sinus
(redirected from Frontal air sinus)

    Also found in: Wikipedia 0.03 sec.
frontal sinus
n.
A hollow formed on either side in the lower part of the squama of the frontal bone, communicating by the ethmoidal infundibulum with the middle meatus of the nasal cavity of the same side.
frontal sinus,
n the cavity located behind the forehead through which air flows.
Enlarge picture
Frontal sinus.
frontal sinus,
n See sinus(es), frontal.


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