sinus
IPA: sˈaɪnʌs
noun
- (anatomy, zootomy) A pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
- (anatomy) An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
- (physiology, attributive) Relating to or denoting the sinoatrial node of the heart or its function of regulating the heartbeat.
- (pathology) An abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface.
- (botany) A rounded notch or depression between two lobes or teeth in the margin of a leaf or petal.
- (geography) A bay of the sea; a recess in the shore.
- (trigonometry) Synonym of sine.
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Examples of "sinus" in Sentences
- My sinus congestion always acts up during allergy season
- The doctor suggested using a saline spray to clear out my sinus passages
- Sinus headaches can be incredibly debilitating and make it hard to concentrate
- A sinus infection can cause facial pain and pressure around the eyes
- I always sneeze uncontrollably when my sinus allergies are triggered
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