Dictionary![]() ![]() di•a•phonePronunciation: (dī'u-fōn"), [key] —n. 1. a foghorn producing a low-pitched, penetrating signal of two tones. 2. Phonet. a. a phoneme in one dialect corresponding to a similar but phonetically different phoneme in a related dialect. b. a group of sounds comprising all the phonetically different dialectal variants of a given phoneme in a language: The broad a and flat a of “half ” are members of a single diaphone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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