sinus.
sinus:
Meaning & usage
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)
sinus: an abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface
sine: in a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse
Where this word comes from
Borrowed from Dutch sinus, from Latin sinus.
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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.