noun
crystal detector
An early radio component that uses a mineral crystal to rectify radio signals. Historical term, now mostly of interest in vintage radio contexts.
鉱石検波器は、初期のラジオ受信機に使われていた。
Crystal detectors were used in early radio receivers.
Compound of 鉱石 (mineral ore) + 検波器 (detector). The term describes a detector that uses a mineral crystal for rectification.