This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Plural form of diphthong.

"I know it’s a curse, and I promptly file the word into the English compartment of my head, a corner where I am no longer a law-abiding tour guide for the House of Friendship and Peace but someone completely different, someone whose vowels are called diphthongs, whose l’s lilt and r’s roll, and whose sentences, unlike those in our docile Russian, soar at the end."