Polyphone

n.

1.

A character or vocal sign representing more than one sound, as read, which is pronounced rēd or rĕd.

Noun

1.

polyphone - a letter that has two or more pronunciations; "`c' is a polyphone because it is pronounced like `k' in `car' but like `s' in `cell'" Synonyms: polyphonic letter

alphabetic character, letter, letter of the alphabet, polyphonic letter