sinus.
bowl for serving wine, etc; curved or bent surface; bending, curve, fold; bosom, lap; bay;
Meaning & usage
a bent surface; a curve, fold, hollow
the hanging fold of a toga over the breast; a pocket, lap a purse, money (which was carried in the bosom of the toga)
the hanging fold of a toga over the breast; a pocket, lap a garment
the hanging fold of a toga over the breast; a pocket, lap the bosom, breast
the hanging fold of a toga over the breast; a pocket, lap the bosom for love, protection, asylum
the hanging fold of a toga over the breast; a pocket, lap the interior, inmost part of a thing
the hanging fold of a toga over the breast; a pocket, lap a power, possession of someone
the hanging fold of a toga over the breast; a pocket, lap a hiding place, place of concealment; a secret feeling
a gulf, bay, bight
a gulf, bay, bight the land lying on or a point of land that helps to form a gulf
a gulf, bay, bight a basin, hollow, valley
a gulf, bay, bight a fjord
the chord of an arc; a sine
Where this word comes from
Inherited from Proto-Italic *sinus, from Proto-Indo-European *sinos. Akin to Albanian gji (“breast, bosom”). The mathematical sense “chord of an arc, sine” was introduced in the 12th century by Gherardo of Cremona as a semantic loan from Arabic جِيبَ (jība, “chord, sine”) (ultimately a loan from Sanskrit ज्या (jyā, “bowstring”)) by confusion with جَيْب (jayb, “bosom, fold in a garment”).
alternative form of sīnum (“large round drinking vessel”)
Where this word comes from
From Proto-Indo-European *sh₁ih₂sno-, deverbative of *seh₁y- (“to sift, strain”) (compare Ancient Greek ἠθέω (ēthéō), Lithuanian sijóti, Serbo-Croatian sȉjati).
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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.