Phi Definition

fī, fē
noun
The twenty-first letter of the Greek alphabet (Φ, φ)
Webster's New World
Webster's New World
A visual illusion caused by lights turning on and off in a sequential pattern that implies motion.
Wiktionary

Other Word Forms of Phi

Noun

Singular:
phi
Plural:
phis

Origin of Phi

  • Late Greek phī from Greek phei

    From American Heritage Dictionary of the English Language, 5th Edition

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phi