Dictionary.com

diphthongize

[ dif-thawng-ahyz, -gahyz, -thong-, dip- ]
/ ˈdɪf θɔŋˌaɪz, -ˌgaɪz, -θɒŋ-, ˈdɪp- /
Phonetics

verb (used with object), diph·thong·ized, diph·thong·iz·ing.

to change into or pronounce as a diphthong.

verb (used without object), diph·thong·ized, diph·thong·iz·ing.

to become a diphthong.

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Also especially British, diph·thong·ise .

Origin of diphthongize

First recorded in 1865–70; diphthong + -ize

OTHER WORDS FROM diphthongize

diph·thong·i·za·tion, noun

Words nearby diphthongize

diphtheritic, diphtheritic membrane, diphtheroid, diphthong, diphthongia, diphthongize, diphycercal, diphyletic, diphyllobothriasis, Diphyllobothrium, diphyllous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for diphthongize

diphthongize

diphthongise

/ (ˈdɪfθɒŋˌaɪz, -ˌɡaɪz, ˈdɪp-) /

verb

(often passive) to make (a simple vowel) into a diphthong

Derived forms of diphthongize

diphthongization or diphthongisation, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012