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.
Words nearby frontal sinus
frontal gyrus,
frontal lobe,
frontal nerve,
frontal plane,
frontal pole,
frontal sinus,
frontal sulcus,
frontal suture,
frontalis,
frontality,
frontenac