zwitter hypothesis

[zwĭtər, tsvĭt-]
n.
  1. The hypothesis that an ampholyteric electrode, such as an amino acid, yields equal numbers of basic and acid ions at the isoelectric point, thus becoming a zwitterion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.