ハ行ぎょう転てん呼こ音おん

noun

historical sound shift of ha-row kana to wa-row sounds in non-initial position

Linguistics term referring to the historical change in Japanese where は・ひ・ふ・へ・ほ were pronounced as わ・い・う・え・お when not at the beginning of a word. This shift is reflected in historical kana usage.

• 「ハ行ぎょう転てん呼こ音おん」は、日本にほん語ご史しの音おん韻いん変へん化かの一ひとつです。

  "Ha-gyō tenko-on" is one of the phonological changes in the history of the Japanese language.

• 歴れき史し的てき仮か名な遣づかいでは、ハ行ぎょう転てん呼こ音おんによって「川かわ」を「かは」と書かきます。

  In historical kana orthography, due to ha-gyō tenko-on, 'kawa' (river) is written as 'kaha'.