ウェブ2024年5月21日 · 光. English Wikipedia has an article on: Light. pi1kari → * /pʲikari/ → /ɸikari/ → /hikari/. From Old Japanese . Nominalization of the 連用形 (ren'yōkei, “continuative or stem form”) of verb 光る (hikaru, “to shine, to glitter, to gleam ”).