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phi

American  
[fahy] / faɪ /

noun

phis plural
  1. the 21st letter of the Greek alphabet (Φ, φ).

  2. the consonant sound represented by this letter.


phi British  
/ faɪ /

noun

  1. the 21st letter in the Greek alphabet (Φ, φ), a consonant, transliterated as ph or f

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This is what Wang and his colleagues have proposed in a recent preprint study: the movement of the phi mesons themselves creates a strong force field whose minuscule fluctuations are affecting mesons’ spin polarization.

From Scientific American • Feb. 2, 2023

Alpha, beta, upsilon, phi / Tuition here is too damn high!

From Seattle Times • Dec. 26, 2019

Alpha, beta, upsilon, phi / Tuition here is too damn high!

From Washington Times • Dec. 26, 2019

Having seen the alpha and omega of the series, I'm eager to see the gamma, delta, epsilon and phi, or whichever intermediate Greek letters you want to represent those four other episodes.

From Los Angeles Times • Feb. 13, 2019

The letters phi, psi, sigma, zeta, which require a great deal of wind, are employed in the imitation of such notions as shivering, seething, shaking, and in general of what is windy.

From Cratylus by Jowett, Benjamin

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