温水的英文是warm water。warm来自古英语的wearm，意思是温暖的；water来自古英语的waeter，意思是水。

例句：

I like to drink warm water when I wake up in the morning.（我喜欢在早上起床后喝温水。）

Can you please fill up this cup with some warm water?（你能把这个杯子装满温水吗？）

Warm water is often used for relaxation and stress relief.（温水常用于放松和减压。）