Where does “三角錐” come from?

三角錐 (Japanese) comes from Japanese 三角, from Japanese 三, from Middle Chinese さん.

三角錐 (Japanese): triangular pyramid, tetrahedron

Definitions

  1. triangular pyramid, tetrahedron

Ancestry of “三角錐”, step by step

三角錐 traces back through two separate lines of ancestry.

via Japanese 三角

StepLanguageWordMeaning
1Japanese三角triangle
2Japanese三three, 3; third; three
3Middle Chineseさん—

via Korean 錐

StepLanguageWordMeaning
1Korean錐cone
Every word from Middle Chinese さん →Every word from Japanese 三 →Every word from Japanese 三角 →
三角錐 — Etymology, Origin & Word History | Etymology Explorer