dictograph
🇬🇧/ˈdɪktəɡrɑːf/ 🇺🇸/ˈdɪktəˌɡræf/a telephonic instrument for secretly monitoring or recording conversations by means of a small, sensitive, and often concealed microphone 电话侦听器
noun [具体名词] 窃听器；侦听器
a telephonic instrument for picking up sounds in one room and transmitting them to another or recording them. 一种用于接收一个房间内的声音并将其传送到另一个房间或进行录音的电话设备。
