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hot cathode▼◼◼◼noun[UK: hɒt ˈkæ.θəʊd] [US: hɑːt ˈkæθoʊd]
thermionic valve▼[UK: ˌθɜː.mɪ.ˈɒ.nɪk vælv] [US: ˌθɝː.mɪ.ˈɒ.nɪk ˈvælv]
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