adjective Chemistry.
capable of functioning either as an acid or as a base.

1840–50; < Greek amphóter(os) (comparative of ámphō both; cognate with Latin ambō) + -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
amphoteric (ˌæmfəˈtɛrɪk)
chem Also: amphiprotic able to function as either a base or an acid
[C19: from Greek amphoteros each of two (from amphō both) + -ic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"neither acid nor alkaline," 1849, from Gk. amphoteros "both," variant of amphi- (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

amphoteric am·pho·ter·ic (ām'fə-těr'ĭk)
Having the capacity to react as either an acid or a base.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
amphoteric   (ām'fə-těr'ĭk)  Pronunciation Key 
Capable of reacting chemically as either an acid or a base. Water, ammonia, and the hydroxides of certain metals are amphoteric.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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