Other Definitions
sinus (dict)

Sinus

• The air cavities in the cranial bones, especially those near the nose and connecting to it. These are the paranasal sinuses and are usually what is meant when a person's "sinuses" are referred to.
• A dilated portion of a blood vein, such as inside the braincase.
• A chronically infected tract such as a fistula.

See also

• Sinus is a Latin name for the trigonometric function sine, a concept of mathematics. (See trigonometry.)

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