borrowed from German amphoterisch, from Greek amphóteros "either of two, (in plural) both" (derivative, with the suffix of ordering -teros, of ámphō "both") + -isch -ish — more at ambi-
1832, in the meaning defined above
“Amphoteric.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/amphoteric. Accessed 1 Dec. 2023.
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