Where does “鎧球” come from?

鎧球 (Japanese) comes from Japanese 球, from Middle Chinese 毬.

Ancestry of “鎧球”, step by step

鎧球 traces back through two separate lines of ancestry.

via Japanese 球

StepLanguageWordMeaning
1Japanese球sphere, globe, orb; pitch; vacuum tube, valve
2Middle Chinese毬—

via Japanese 鎧

StepLanguageWordMeaning
1Japanese鎧armor
Every word from Middle Chinese 毬 →Every word from Japanese 球 →