Diphthong Definition

dĭfthông, -thŏng, dĭp-
diphthongs
noun
A complex vowel sound made by gliding continuously from the position for one vowel to that for another within the same syllable, as ( = ä→) in down, (ī = ä→ē) in ride, ( = ô→ē) in boy.
Webster's New World
Either of the ligatures æ or œ, pronounced as diphthongs in classical Latin.
Webster's New World
The definition of a diphthong is a vowel sound made by gliding from one vowel sound to the next.
An example of a dipthong is the oa in the word coat.
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Other Word Forms of Diphthong

Noun

Singular:
diphthong
Plural:
diphthongs

Origin of Diphthong

  • Middle English diptonge from Old French diptongue from Late Latin diphthongus from Greek diphthongos di- two di–1 phthongos sound

    From American Heritage Dictionary of the English Language, 5th Edition

  • French diphtongue, from Ancient Greek δίφθογγος (diphthongos, “two sounds”), from δίς (dis, “twice”) + φθόγγος (phthongos, “sound”).

    From Wiktionary

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