aphthong

noun

1. A letter or combination of letters employed in spelling a word but not pronounced; a silent letter or polygraph

   archaic

   The letters "gh" in "knight" are an aphthong.

Where it comes from

From Ancient Greek ἄφθογγος (áphthongos). Compare diphthong.

Adapted from the Wiktionary entry aphthong (CC BY-SA 4.0).

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