Where does “速度計” come from?

速度計 (Japanese) comes from Japanese 計, from Middle Chinese 計.

速度計 (Japanese): speedometer

Definitions

  1. speedometer

Ancestry of “速度計”, step by step

速度計 traces back through two separate lines of ancestry.

via Japanese 計

StepLanguageWordMeaning
1Japanese計plan, total; -meter
2Middle Chinese計—

via Japanese 速度

StepLanguageWordMeaning
1Japanese速度speed; velocity; velocity
Every word from Middle Chinese 計 →Every word from Japanese 計 →