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ENGLISH · A WORD WITH POSSIBILITIES

sine.

In a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse.

4 characters1 syllables approx.English language

Meaning & usage

noun/saɪn/
  1. 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

Etymology tree Proto-Indo-European *sinos Proto-Italic *sinus Latin sinusbor. English sine Borrowed from Latin sinus (“curve, bend; bosom”), a translation of Arabic جَيْب (jayb, “bosom”), a misidentification of the notation جيب (j-y-b), written without vowel diacritics, standing for Arabic جِيبَ (jība, “sine”), in turn from Sanskrit ज्या (jyā, “sine, chord, bowstring”) through the similar Sanskrit जीव (jīva, “sine, chord, life, existence”). Doublet of 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.