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[ que ), a compar. form of άμφω = L. ambo, both: see ambi-.] Partly the one and partly the other; neutral. Smart (1849). - Amphoteric reaction, in chem., a reaction appearing both acid and alkaline in its effect on colors used as tests. amphotis (am-fo'tis), n.; pl. amphotides (amfot'i-dez). [