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Definition of crystal set noun from the Oxford Advanced Learner's Dictionary

crystal set

noun
 
/ˈkrɪstl set/
 
/ˈkrɪstl set/
(also crystal radio)
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  1. a simple early radio that was listened to wearing headphonesTopics TV, radio and newsc2
See crystal set in the Oxford Advanced American Dictionary
Check pronunciation: crystal set

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