noun
mosquito tone
A high-frequency sound (typically around 17–18 kHz) that most adults cannot hear, originally used as a youth deterrent. Often discussed in contexts of hearing ability and age-related hearing loss.
モスキート音は若者にしか聞こえないと言われている。
It is said that mosquito tones can only be heard by young people.
このアプリでモスキート音を再生し
I played a mosquito tone with this app to check my hearing age.