a combining form meaning “sound,” “voice,” used in the formation of compound words: phonology.
Also, especially before a vowel, phon-.
Compare -phone, -phony.

1945–50; < Greek, combining form representing phōnḗ voice Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phono- or (before a vowel) phon-
combining form
indicating a sound or voice: phonograph; phonology
[from Greek phōnē sound, voice]
phon- or (before a vowel) phon-
combining form
[from Greek phōnē sound, voice]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

comb. form meaning "sound, voice," from Gk. phono-, comb. form of phone "voice, sound" (see fame).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

phono- or phon-
sound; voice; speech: phonometer.

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