from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Containing three atoms per molecule.
- adj. Containing three replaceable atoms or radicals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Consisting of three atoms.
from the GNU version of the Collaborative International Dictionary of English
- adj. Having three atoms; -- said of certain elements or radicals.
- adj. Having a valence of three; trivalent; sometimes, in a specific sense, having three hydroxyl groups, whether acid or basic.
from The Century Dictionary and Cyclopedia
- In chem.: Consisting of three atoms: applied to the molecules of elements where the atoms are of the same kind: as, a triatomic element; or to compounds where the atoms are unlike: as, triatomic molecules.
- Same as trivalent.
- Having three hydroxyl groups by which other atoms or radicals may be attached without altering the structure of the rest of the molecule: thus, glycerin is called a triatomic alcohol.
Sorry, no etymologies found.