a hole (in a door or an oven etc) through which you can peep
peephole的用法和样例:
例句
用作名词 (n.)
He squinted through the peephole. 他眯起眼睛靠近窥视孔看了看。
But the instant she closed the door, she peered through the peephole and saw he was still standing by the gate. 然而,她刚一关上房门,就迫不及待地从门镜中向外望去,只见他仍然站在外面的大门旁。