Where does “空中線” come from?

空中線 (Japanese) comes from Japanese 空中, from Middle Chinese 空中.

空中線 (Japanese): an aerial

Definitions

  1. an aerial

Ancestry of “空中線”, step by step

空中線 traces back through two separate lines of ancestry.

via Japanese 空中

StepLanguageWordMeaning
1Japanese空中midair; the air; the sky
2Middle Chinese空中—

via Japanese 線

StepLanguageWordMeaning
1Japanese線line; level; beam
Every word from Middle Chinese 空中 →Every word from Japanese 空中 →
空中線 — Etymology, Origin & Word History | Etymology Explorer