What does diphthong mean?
It is a noun that is used in linguistics and means two vowel sounds joined in one syllable to form one speech sound.
How do you pronounce it?
/ˈdɪfθɔŋ/
or
[diph·thawng]Where does it come from?
Middle English diptonge, from Middle French diptongue, from Late Latindipthongus, from Greek diphthongos, from di- + phthongos voice, sound
How do you use it?
The sounds of “ou” in “out” and of “oy” in “boy” are diphthongs.