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1. Capable of reacting with four molecules of a monobasic acid. Used of a base.
2. Containing four replaceable hydrogen atoms. Used of an acid or acid salt.
An acid containing four replaceable hydrogen atoms.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Chemistry) (of a base) capable of reacting with four molecules of a monobasic acid
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014