Where does “赤外線” come from?

赤外線 (Japanese) comes from Japanese 外, from Middle Chinese 外.

赤外線 (Japanese): infrared radiation; Short for 赤外線通信

Definitions

  1. infrared radiation; Short for 赤外線通信

Ancestry of “赤外線”, step by step

赤外線 traces back through 3 separate lines of ancestry.

via Japanese 外

StepLanguageWordMeaning
1Japanese外(the) outside
2Middle Chinese外—

via Japanese 赤

StepLanguageWordMeaning
1Japanese赤red; communism, socialism; a communist

via Japanese 線

StepLanguageWordMeaning
1Japanese線line; level; beam

Words derived from “赤外線”

Every word from Middle Chinese 外 →Every word from Japanese 外 →