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Added 10 October 2026

phi

/faɪ/ symbol

Latin root: phi Wiktionary

symbol Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about phi at Wordnik → Where our words come from →

ISO 639-2 & ISO 639-5 language code for Philippine languages.

noun

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.

Origin

From Late Latin phi, from Ancient Greek φεῖ (pheî).

From Wiktionary, via Kaikki.org (CC BY-SA)

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