diphthong: Meaning and Definition of

diph•thong

1. an unsegmentable, gliding speech sound varying continuously in phonetic quality but held to be a single sound or phoneme and identified by its apparent beginning and ending sound, as the oi-sound of toy or boil.
2. (not in technical use)
1. a digraph, as the ea of meat.
2. a ligature, as æ.

1. to diphthongize.