Where does “長母音” come from?

長母音 (Japanese) comes from Japanese 長, from Middle Chinese 長.

長母音 (Japanese): a long vowel

Definitions

  1. a long vowel

Ancestry of “長母音”, step by step

長母音 traces back through two separate lines of ancestry.

via Japanese 長

StepLanguageWordMeaning
1Japanese長chief, head, leader; strong point; major
2Middle Chinese長—

via Japanese 母音

StepLanguageWordMeaning
1Japanese母音vowel
Every word from Middle Chinese 長 →Every word from Japanese 長 →