Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
of a simple vowel
: to change into a diphthong
: to pronounce as a diphthong
1867, in the meaning defined at intransitive sense
Keep scrolling for more
Resources for diphthongize
Time Traveler for diphthongize
See more words from the same year
Comments on diphthongize
What made you want to look up diphthongize? Please tell us where you read or heard it (including the quote, if possible).
alleviating pain or harshness
Get Word of the Day daily email!
Musical Words Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Sorry, not sorry
The participle made famous by Elvis
A not-so-sarcastic history
Words from the week of 9/14/2018
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How we chose 'feminism'
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
A quiz in common time.
SCRABBLE® fans, sharpen your skills!