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phi

[fahy]
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noun, plural phis.
  1. the 21st letter of the Greek alphabet (Φ, φ).
  2. the consonant sound represented by this letter.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for phi

phi

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

Word Origin and History for phi

twenty-first letter of the Greek alphabet; see ph.

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Online Etymology Dictionary, © 2010 Douglas Harper

phi in Medicine

phi

n.
  1. The 21st letter of the Greek alphabet.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.