瞳 means “pupil (of the eye)”

ひとみ · hitomi

Also: pupil (of eye)

Kun'yomi (Japanese reading)
ひとみ
On'yomi (Chinese reading)
ドウ, トウ

JLPT N1 · Taught in secondary school · 17 strokes

The story

An eye (目) and a child (童): picture the tiny figure you see reflected in someone's pupil. 瞳 is the pupil and the eye at its most poetic, the eye of love songs, a girl's name, Hitomi, and 瞳孔 in the doctor's notes.

Used in 瞳 (hitomi, pupil/eye) and 瞳孔 (doukou, pupil, in medicine)

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