sinus
Pronunciation: /ˈsaɪ.nəs/
The English word “sinus” has 7 meanings listed here.
noun
- 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).
- An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
- Relating to or denoting the sinoatrial node of the heart or its function of regulating the heartbeat.
- An abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface.
- A rounded notch or depression between two lobes or teeth in the margin of a leaf or petal.
- A bay of the sea; a recess in the shore.
- Synonym of sine.
Etymology
Learned borrowing from Latin sinus (“a bent surface, curve, hollow”). Doublet of sine.
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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.