三さん重じゅう母ぼ音いん

さ

ん

じゅ

う

ぼ

い

ん

Meanings

1

noun

triphthong

A linguistic term for a vowel sound that glides through three distinct qualities within a single syllable.

三three

重heavy, important, esteem

母mother

音sound, noise

二に重じゅう母ぼ音いん
二重母音 (diphthong) involves two vowel qualities, while 三重母音 involves three.
単たん母ぼ音いん
単母音 (monophthong) is a single, stable vowel quality, unlike the gliding nature of a triphthong.

Compound of 三重 (さんじゅう, 'triple') and 母音 (ぼいん, 'vowel'), a straightforward calque of the English term 'triphthong'.