Hypertext Webster Gateway: "polyatomic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Polyatomic \Pol`y*a*tom"ic\, a. [Poly- + atomic.] (Chem.)
(a) Having more than one atom in the molecule; consisting of
several atoms.
(b) Having a valence greater than one. [Obs.]
From WordNet (r) 1.7 (wn)
polyatomic
adj : of or relating to a molecule made up of more than two atoms
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