noun / adjective
sinus
SIGH-nuhs/ˈsaɪnəs/
A cavity or passage within the body.
The sinuses above the eyes connect to the nasal passages.
Etymology
Latin sinus described a bend or fold, an image extended in anatomy to a hollow or cavity. The nasal sinus is a specialized example: an air-filled hollow in the skull connected to the nose.
In context
if they're having sinus infections they can't clear their nose
More examples
- A sinus infection causes pressure around her cheeks.
- The scan shows fluid in his left maxillary sinus.
- Some sinuses carry blood rather than air.
Forms
sinus · sinuses
sinusitis noun — Inflammation of the lining of nasal sinuses.