phi

[ fahy ]
/ faɪ /

noun, plural phis.

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

Medicine definitions for phi

phi

n.

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.