👉 The term "diphthongal" is an English word that refers to a type of vowel sound that is used in certain languages, especially in languages with a rich phonetic system. These vowels are often found between two consonants and can be pronounced as one or two syllables. For example, the vowels "a", "e", "i", and "o" are all diphthongs, while "u" is an umbral vowel that is not considered part of a