三さん重じゅう母ぼ音いんさんじゅうぼいんMeanings1nountriphthongA linguistic term for a vowel sound that glides through three distinct qualities within a single syllable.英えい語ごの「fire」の母ぼ音いんは三さん重じゅう母ぼ音いんの例れいとして挙