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In phonetics, a diphthong is a vowel combination usually involving a quick but smooth movement from one vowel to another, often interpreted by listeners as a single vowel sound or phoneme. While "pure" vowels are said to have one target tongue position, diphthongs have a moving tongue. Pure vowels are represented in phonetic script by one symbol: English "seem" as [si:m], for example. Diphthongs are represented by two symbols, for example English "same" as [seim], where the two vowel symbols are intended to represent approximately the beginning and ending tongue positions.

Diphthongs in English: [5]

Diphthongs in Spanish: Diphthongs in French: Diphthongs in German: