虹 means “rainbow”

にじ · niji

Kun'yomi (Japanese reading)
にじ
On'yomi (Chinese reading)
コウ

Taught in secondary school · 9 strokes

The story

An insect (虫) arches across the sky: ancient peoples imagined the rainbow as a great serpent drinking from the earth. 虹 (niji) appears after rain, a bridge between sky and land.

Used in 虹色 (nijiiro, rainbow-colored) and 二重虹 (nijuuniji, double rainbow)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.