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1906, in the meaning defined above
German, from Zwitter hybrid (from Old High German zwitaran, from zwi-) + Ion ion — more at twi-
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“Zwitterion.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/zwitterionic?pronunciation&lang=en_us&dir=z&file=zwitte02. Accessed 12 December 2019.
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a period of high artistic development
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