• synonyms


[ fahy ]
/ faɪ /

noun, plural phis.

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

Nearby words

pheresis, pheromone, pheromones, phew, phfft, phi, phi beta kappa, phi bete, phi-function, phi-phenomenon, phial Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for phi

British Dictionary definitions for 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

Word Origin and History for phi


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

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for phi



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.