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[fahy] /faɪ/
noun, plural phis.
the 21st letter of the Greek alphabet (Φ, φ).
the consonant sound represented by this letter. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for phi


noun (pl) 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
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Word Origin and History for phi

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

Online Etymology Dictionary, © 2010 Douglas Harper
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phi in Medicine

phi n.

Symbol φ The 21st letter of the Greek alphabet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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