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The American Heritage® Dictionary of the English Language, 4th Edition
adj.
Having four atoms per molecule.
adj.
Having four replaceable univalent atoms or radicals.
Wiktionary, Creative Commons Attribution/Share-Alike License
adj.
consisting of four atoms
the GNU version of the Collaborative International Dictionary of English
adj.
Consisting of four atoms; having four atoms in the molecule, as phosphorus and arsenic.
adj.
Having a valence of four; quadrivalent; tetravalent; sometimes, in a specific sense, having four hydroxyl groups, whether acid or basic.
The Century Dictionary and Cyclopedia
Same as tetradic.
Cross Reference
diatomic
monatomic
triatomic
Synonym
Words with the same meaning
quadrivalent
tetravalent