Definify.com
Webster 1913 Edition
Aphthong
Aph′thong
(?; 277)
, Noun.
[Gr. [GREEK] silent;
ἀ
priv. + [GREEK] voice, sound, fr. [GREEK] to sound.] A letter, or a combination of letters, employed in spelling a word, but in the pronunciation having no sound.
– Aph-thon′gal
, Adj.
Webster 1828 Edition
Aphthong
APH'THONG
,Noun.
A letter or combination of letters, which, in the customary pronunciation of a word, have no sound.