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deuterium [deuteriums]▼◼◼◼noun[UK: djuː.ˈtɪə.riəm] [US: duː.ˈtiː.riəm]
heavy hydrogen▼◼◻◻noun[UK: ˈhe.vɪ.ˈhaɪ.drɪ.dʒən] [US: ˈhe.vɪ.ˈhaɪ.drɪ.dʒən]
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