pupil of the eye
Refers to the dark central part of the eye. In more technical or medical contexts, 瞳孔 is the more precise term.
See also: 瞳孔
暗い所では瞳が大きくなる。
In a dark place, the pupils become larger.
A cat's pupils narrow depending on the light.
A common, slightly descriptive word for a person's eyes, often used when focusing on their look, color, shine, or emotional expression rather than simply saying 目.
彼女は澄んだ瞳をしている。
She has clear eyes.
その知らせを聞いて、彼の瞳が輝いた。
When he heard the news, his eyes lit up.
Her eyes sparkled like stars.
He gazed steadily into her eyes.
Her eyes welled up when she heard the story.
That child had blue eyes.
Search-only kanji form; not a practical spelling for ordinary writing.