from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having the characteristics of an acid and a base and capable of reacting chemically either as an acid or a base.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having the characteristics of both an acid and a base, and capable of reacting as either; amphiprotic.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Partly one and partly the other; neither acid nor alkaline; neutral.

from The Century Dictionary and Cyclopedia

  • Partly the one and partly the other; neutral.
  • In chem., capable, in different reactions, of exhibiting both acid and basic character, as, for example, glycoeoll or amidoacetic acid.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. having characteristics of both an acid and a base and capable of reacting as either


From Greek amphoteros, each of two, from amphō, both.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἀμφότερος ("each of two"), from ἄμφω ("both"). (Wiktionary)


  • Turns out the official Wikipedia answer is that it is an amphoteric compound reacting with both acids and bases and aqueous solutions are mildly alkaline.

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  • There are four types of detergents: anionic, nonionic, cationic, and amphoteric.


  • Other words for stabilizer are: amphoteric, neutral or intermediate oxide.

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  • Announced that the Canadian Patent Office issued a Notice of Allowance for patent application 2,438,116 with claims that broadly cover amphoteric liposomal formulations SMARTICLES ® and their use for the delivery of nucleic acids and other compounds with therapeutic application;

  • Baking soda is an amphoteric, which basically means that it's a neutralizer because it reacts with both acids and bases.

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  • Surfactants, the active ingredients in wetter-spreader adjuvant, are further categorized as non-ionic, cationic, anionic, or amphoteric surfactants.

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  • Mild cleansing compositions - Mild cleansing compositions comprising anionic, nonionic and / or amphoteric surfactants, one or more dyes having a total color, and one or more encapsulated dyes, including microencapsulated dyes, in microcapsules prepared by coacervation, precipitation, polycondensation or other reaction of anionic and cationic components, which encapsulated dyes have a total color different from ... Notable Patent Applications - 05/07/2009

  • Aim of this work is the development and testing of novel amphoteric nanosized poly (amidoamine) hydrogel film incorporating 4-aminobutylguanidine (agmatine) moieties to create RGD-mimicking repeating units for promoting cell adhesion.

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  • A systematic comparative study of the response of an epithelial cell line was performed on hydrogels with agmatine and on non-functionalized amphoteric poly (amidoamine) hydrogels and tissue culture plastic substrates.

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  • ammunition, storage of, 741 see also guns amphoteric detergents, 438-39



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