Diphthong

American English pronunciation of "no highway cowboys" /noʊ ˈhaɪweɪ ˈkaʊbɔɪz/, showing five diphthongs: /, , , , ɔɪ/

A diphthong (/ˈdɪfθɒŋ, ˈdɪp-/ DIF-thong, DIP-;[1] from Ancient Greek δίφθογγος (díphthongos) 'two sounds', from δίς (dís) 'twice' and φθόγγος (phthóngos) 'sound'), also known as a gliding vowel or a vowel glide, is a combination of two adjacent vowel sounds within the same syllable.[2] Technically, a diphthong is a vowel with two different targets: that is, the tongue (and/or other parts of the speech apparatus) moves during the pronunciation of the vowel. In most varieties of English, the phrase "no highway cowboy" (/n ˈhw ˈkbɔɪ/ noh HY-way KOW-boy) has five distinct diphthongs, one in every syllable.

Diphthongs contrast with monophthongs, where the tongue or other speech organs do not move and the syllable contains only a single vowel sound. For instance, in English, the word ah is spoken as a monophthong (/ɑː/), while the word ow is spoken as a diphthong in most varieties (//). Where two adjacent vowel sounds occur in different syllables (e.g. in the English word re-elect) the result is described as hiatus, not as a diphthong.

Diphthongs often form when separate vowels are run together in rapid speech during a conversation. However, there are also unitary diphthongs, as in the English examples above, which are heard by listeners as single-vowel sounds (phonemes).[3]

  1. ^ "diphthong". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 13 April 2021.
  2. ^ "diphthong". Merriam-Webster.com Dictionary. Merriam-Webster.
  3. ^ "Definition of 'Diphthong'". SIL International. Retrieved 17 January 2008.

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