amphoterism

[ăm′fə-tĕr′ĭz′əm, ăm-fŏt′ə-rĭz′əm]

n.

The quality of exhibiting the characteristics of an acid and a base and having the capacity to react either as 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.