adjective Chemistry.
pertaining to a molecule containing more than two atoms.

1855–60; poly- + atomic

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World English Dictionary
polyatomic (ˌpɒlɪəˈtɒmɪk)
(of a molecule) containing more than two atoms

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Example sentences
Vibrational and electronic energy levels of polyatomic transient molecules.
Spectroscopic and dynamical studies of highly energized small polyatomic molecules.
Isobaric and polyatomic interferences relating to the technique must be recognized and corrected.
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