“Old kana orthography” in Japanese
Short answer
Old kana orthography in Japanese is “旧仮名” (kyuukana). Full meaning: old kana orthography (used before 1946 reform), historical kana orthography.
Other ways to say “Old kana orthography” in Japanese
旧仮名遣い
kyuukanazukai old kana orthography (used before 1946 reform), historical kana orthography
歴史的仮名遣い
rekishitekikanazukai historical kana orthography (used before 1946 reform), old kana orthography
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