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phi

[ fahy ]
/ faɪ /
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noun, plural phis.

the 21st letter of the Greek alphabet (Φ, φ).
the consonant sound represented by this letter.

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The rainy weather could not ________ my elated spirits on my graduation day.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for phi

phi
/ (faɪ) /

noun plural phis

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

Medical definitions for phi (1 of 2)

phi

n.

The 21st letter of the Greek alphabet.

Medical definitions for phi (2 of 2)

φ

The Greek letter phi. Entries beginning with this character are alphabetized under phi.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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