polyphone
American Heritage Dictionary:
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pol·y·phone
(pŏl'ē-fōn') 
n.
A written character or combination of characters having two or more phonetic values, such as the letter a or i in English.
n.
A written character or combination of characters having two or more phonetic values, such as the letter a or i in English.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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