Linguistics term for a sequence of two vowel sounds within a single syllable. Often contrasted with 二重母音, which is a more common synonym.
See also: 二重母音
The 'ai' in the Japanese word 'ai' (love) is often cited as an example of a diphthong.
Compound of 連 (ren, 'linked') and 母音 (boin, 'vowel'), literally 'linked vowels'. A technical term formed from kanji components.