diphthong
/ˈdɪfθɒŋ/noun
1- a sound formed by the combination of two vowels in a single syllable, in which the sound begins as one vowel and moves towards another (as in coin, loud, and side)二合元音, 复合元音（如在coin, loud和side中）。常与MONOPHTHONG, TRIPHTHONG 相对。
1.1
- a digraph representing the sound of a diphthong or single vowel (as in feat)二合元音字母（如在feat中）。
1.2
- a compound vowel character; a ligature (such as œ)元音连字（如æ）。
派生词
diphthongal
/dɪfˈθɒŋgəl/ adjective词源
late Middle English: from French diphtongue, via late Latin from Greek diphthongos, from di- 'twice' + phthongos 'voice, sound'.