雙母音

  關於拼字時兩個一組的母音字母，且通常不分別發成兩個母音的情況，請見「二合字母」。

American English pronunciation of no highway cowboys, showing five diphthongs: /oʊ aɪ eɪ aʊ ɔɪ/

雙母音（diphthong）是一種複母音（compound vowel），又稱雙母音或二合複母音，在語音學中，指聯合的兩個母音，它們作為一個整體出現。之間有平滑的過渡，也就是說，雙母音中的發音牽涉到兩種不同的舌位，並且從其中一種舌位滑動到另一舌位。在國際音標 (IPA) 中，單母音用一個字母表示，如[ʌ]。雙母音用兩個字母表示，如[aɪ]，響度較低的字母可以加上  ̯ 符號以表示它是雙母音的一部份，例如 [aɪ̯]。

雙母音的類型

雙母音依響度的變化可分為上升雙母音與下降雙母音（或稱上升複母音與下降複母音）。上升複母音以響度較低的母音開始，以響度較高的母音結束，例如 [ɪ̯a]。下降複母音以響度較高的母音開始，以響度較低的母音結束，例如 [aɪ̯]。在某些語言或研究中，會將下降複母音視為真正的雙母音，至於上升複母音則傾向於被當作相鄰出現的兩個母音。例如在漢語中，上升複母音常被當作介音與主要母音的結合，而下降複母音則被當作一個整體的押韻單位。

參見

• 音位變異
• 三母音

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