彩 means “color, decorate”

いろどる · irodoru

Also: coloring, paint, makeup

Kun'yomi (Japanese reading)
いろどる
On'yomi (Chinese reading)
サイ

JLPT N1 · Taught in secondary school · 11 strokes

The story

A hand (爫) picking from a tree (木), then three strokes of shimmer (彡): picture gathering flowers to paint with. 彩る is to color or decorate, a bento is judged by its 彩り, and 多彩 means richly varied.

Used in 彩る (irodoru, to color/decorate), 色彩 (shikisai, color/hue), and 多彩 (tasai, varied/colorful)

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