Dual Vowel Sound in One Syllable, as in Join, Loud
This page is the CodyCross answer for the clue below from Sense of Smell, Group 1479, Puzzle 3 (Lighter Fuel).
Question is: Dual Vowel Sound in One Syllable, as in Join, Loud
and the answer is: DIPHTHONG
Word Meaning:
DIPHTHONG — (phonology) A complex vowel sound that begins with the sound of one vowel and ends with the sound of another vowel, in the same syllable.
Definitions from Wiktionary.