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 adverb Monatomic  adv.  (Chem.) (a)Consisting of, or containing, one atom; as, the molecule of mercury is monatomic. (b)Having the equivalence or replacing power of an atom of hydrogen; univalent; as, the methyl radical is monatomic. 
 
 
 
 
 
 Collaborative International Dictionary of English 0.48 
 
 
 
 
 
 
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