额头的英文是 forehead。

来源：forehead 来源于英语词根 fore- 和 -head，fore- 意为 “在前面”，-head 意为 “头”。因此，forehead 意为 “头前部”，指人类或动物头颅前部的部分。

例句：

She wiped the sweat from her forehead with the back of her hand. 她用手背擦掉了额头上的汗。

The baby has a soft and smooth forehead. 这个婴儿有一个柔软光滑的额头。

He furrowed his forehead in concentration as he tried to solve the puzzle. 他皱着额头认真思考，试图解决难题。