The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Of or relating to an acid that can donate more than one proton to a base.
- Of or relating to a base that can accept more than one proton.
Origin: poly- + prot(on) + -ic.