sinuses

4 definitions • 1 example

any of the spaces inside the head that are connected to the back of the nose

a space or passage filled with pus (= a thick yellow liquid) that flows to the surface of the skin

the sinoatrial node (= tissue in the heart responsible for the heart's rhythm):

The electrocardiogram will confirm sinus bradycardia.

any of the hollow spaces in the bones of the head that open into the nose