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The Collaborative International Dictionary of English v.0.48:

Aphthong \Aph"thong\ (?; 277), n. [Gr. ? silent; 'a priv. + ? voice, sound, fr. ? to sound.] A letter, or a combination of letters, employed in spelling a word, but in the pronunciation having no sound. -- Aph*thon"gal, a. [1913 Webster]