小便英文怎么说呢

小便在英语中叫做urination或 peeing。

urination来自拉丁词"urinare"，意思是排尿。
peeing来自英语中的"pee"，意思是小便。

例句：

I need to go to the bathroom to urinate. (我需要去洗手间小便。)
He had to stop the car because he urgently needed to pee. (他不得不停车，因为他急需小便。)