phi.
Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
Meaning & usage
Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
The golden ratio.
A visual illusion whereby a sequential pattern of lights produces a false sense of motion.
Where this word comes from
From Late Latin phi, from Ancient Greek φεῖ (pheî).
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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.