Meaning of the word diphthong in English

What does diphthong mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

diphthong

US /ˈdɪf.θɑːŋ/
UK /ˈdɪf.θɒŋ/
"diphthong" picture

Noun

a sound formed by the combination of two vowels in a single syllable, in which the sound begins as one vowel and moves toward another (as in coin, loud, and side).

Example:
The word 'boy' contains a diphthong.
English has many common diphthongs, such as /aɪ/ in 'my' and /oʊ/ in 'go'.