PENTODES Antonyms There are 3 antonyms of the word pentodes. (opposite meanings)Did you mean?Definition of PENTODESBest Opposite Words For PENTODESTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1diodesnounn2tetrodesnounn3triodesnounn