Where does “イ音便” come from?

イ音便 (Japanese) comes from Japanese イ — la.

イ音便 (Japanese): a form of euphony whereby certain historical morae became い

Definitions

  1. a form of euphony whereby certain historical morae became い

Ancestry of “イ音便”, step by step

イ音便 traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japanesela

via Japanese 音便

StepLanguageWordMeaning
1Japanese音便euphony sound change
Every word from Japanese