sinus
UK: ˈsaɪnəs | US: ˈsaɪnəs
n. a cavity or hollow space in the body, especially one connected to the nostrils
n. a curved or folded anatomical structure
n. (astronomy) a bay or recess in a celestial body
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The word "sinus" comes directly from Latin, where it originally meant "curve," "fold," or "hollow." This term was adopted into anatomical vocabulary to describe natural cavities in the body, such as the nasal sinuses, due to their curved or recessed shapes. Over time, its usage expanded to include other hollow structures in biology and even geographical or astronomical features resembling bays or recesses.
A sinus infection can cause severe headaches and nasal congestion.
The maxillary sinus is located in the cheekbone area.
The coastline had a deep sinus where the river met the sea.
Astronomers observed a dark sinus on the surface of the moon.
The surgeon carefully drained the fluid from the patient’s inflamed sinus.