sinus.
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).
Meaning & usage
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.
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.
Where this word comes from
Learned borrowing from Latin sinus (“a bent surface, curve, hollow”). Doublet of sine.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.