xi.
The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.
Meaning & usage
The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.
Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion.
Where this word comes from
From Ancient Greek ξεῖ (xeî), ξῖ (xî).
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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.