phi

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phi^¹

/faɪ/
/fiː/

Sounds like fie, fee · Rhymes with -aɪ, -iː

Where it comes from

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

noun phis

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. […] tolerance (Frenkel-Brunswik 1949) for it showed that those persons with the strongest defences against internal conflict, i.e. obsessionals and conversion hysterics, were those least able to perceive the reality-conflicting phenomenon of phi.

PHI^²

proper noun

abbreviation Abbreviation of Philadelphia

noun

abbreviation, initialism, uncountable Initialism of protected health information

Thesaurus

Closest in meaning: psi, rho, kappa, theta, oo, healthcare, ssi, isp, sif, poo, psa, ihp, isps, umi, golden ratio, golden mean

Translations

Every language

noun Greek letter

Español	fi
한국어	피 pi
日本語	ファイ fai, フィ fi, ピー pī
中文	弗愛 /弗爱, 佛爱 fú'ài, 斐 fěi
Português	fi
Français	phi
Deutsch	Phi
Ελληνικά	φι fi
Română	fi
Русский	фи fi
العربية	فَاي fay
עברית	פִי fi

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Cite this

MLA

"phi." Wiktionary, via Micwyn, micwyn.com/word/phi. Accessed 6 Nov. 2026.

APA

phi. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/phi

Chicago

"phi." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/phi.

BibTeX

@misc{phi_2026,
  title = {phi},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/phi},
  urldate = {2026-11-06}
}

phi