Usually means: Ion composed of multiple atoms.
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We found 5 dictionaries that define the word polyatomic ion:

General (2 matching dictionaries)
  1. polyatomic ion: Dictionary.com
  2. Polyatomic ion: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. polyatomic ion: Encyclopedia

Medicine (2 matching dictionaries)
  1. Polyatomic ion, Polyatomic ion: Medical dictionary

Definitions from Wikipedia (Polyatomic ion)

noun:  A polyatomic ion (also known as a molecular ion) is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero.


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