vacuum tubeEnglishOxford New American Dictionaryvacuum tube /ˈvakyo͞om ˌt(y)o͞ob, ˈvækjum ˌt(j)ub/ ▸ noun an electron tube containing a near-vacuum that allows the free passage of electric current.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
EnglishOxford New American Dictionary