adj. Having the characteristics of both an acid and a base, and capable of reacting as either; amphiprotic.
the GNU version of the Collaborative International Dictionary of English
adj. Partly one and partly the other; neither acid nor alkaline; neutral.
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.
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
Word Usage
"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."