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polyatomic

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

First recorded in 1855–60; poly- + atomic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for polyatomic

polyatomic

adjective
  1. (of a molecule) containing more than two atoms
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012