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amphoteric

[am-fuh-ter-ik] /ˌæm fəˈtɛr ɪk/
adjective, Chemistry
1.
capable of functioning either as an acid or as a base.
Origin
1840-1850
1840-50; < Greek amphóter(os) (comparative of ámphō both; cognate with Latin ambō) + -ic
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for amphoteric

amphoteric

/ˌæmfəˈtɛrɪk/
adjective
1.
(chem) able to function as either a base or an acid Also amphiprotic
Word Origin
C19: from Greek amphoteros each of two (from amphō both) + -ic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for amphoteric
adj.

"neither acid nor alkaline," 1832, from Greek amphoteros "each or both of two," variant of amphi-.

Online Etymology Dictionary, © 2010 Douglas Harper
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amphoteric in Medicine

amphoteric am·pho·ter·ic (ām'fə-těr'ĭk)
adj.
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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amphoteric in Science
amphoteric
  (ām'fə-těr'ĭk)   
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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