Poly-atomic

polyatomic

[pol-ee-uh-tom-ik]
adjective Chemistry.
pertaining to a molecule containing more than two atoms.

Origin:
1855–60; poly- + atomic

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polyatomic (ˌpɒlɪəˈtɒmɪk)
 
adj
(of a molecule) containing more than two atoms

Collins English Dictionary - Complete & Unabridged 10th Edition
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