from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Containing three replaceable hydrogen atoms per molecule. Used of an acid.
- adj. Containing three univalent basic atoms or radicals per molecule. Used of a base or salt.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. containing three replaceable hydrogen atoms
- adj. having three atoms of a univalent metal
from the GNU version of the Collaborative International Dictionary of English
- adj. Capable of neutralizing three molecules of a monacid base, or their equivalent; having three hydrogen atoms capable of replacement by basic elements on radicals; -- said of certain acids; thus, citric acid is a tribasic acid.
from The Century Dictionary and Cyclopedia
- In chem., having three hydrogen atoms replaceable by equivalents of a base: noting some acids.
Sorry, no etymologies found.