瞳 (tóng) — pupil (of the eye) | TongTong Chinese Dictionary

Definition

Bound form meaning 'pupil of the eye' — almost always appears in 瞳孔, never used alone.

bound form

pupil (of the eye)

。
Tā de yì zhī yǎn jing de tóng kǒng shì lán sè de.
The pupil of one of his eyes is blue.
。
Yī shēng jiǎn chá le tā de tóng kǒng fǎn yìng.
The doctor checked his pupillary response.
。
Guāng xiàn huì ràng tóng kǒng suō xiǎo.
Light will make the pupil contract.