Where does “頁岩” come from?

頁岩 (Japanese) comes from Japanese 岩, from Old Japanese いわ.

頁岩 (Japanese): shale

Definitions

  1. shale

Ancestry of “頁岩”, step by step

頁岩 traces back through two separate lines of ancestry.

via Japanese 岩

StepLanguageWordMeaning
1Japanese岩rock
2Old Japaneseいわ—

via Japanese 頁

StepLanguageWordMeaning
1Japanese頁—
Every word from Old Japanese いわ →Every word from Japanese 岩 →