祖沖之

Zu Chongzhi (429-500), astronomer and mathematician

(possessive particle, literary equivalent of 的[de5]) / him / her / it

surname Zu

ancestor / forefather / grandparents

(of water) to dash against / to mix with water / to infuse / to rinse / to flush / to develop (a film) / to rise in the air / to clash / to collide with