polyatomic

adjective
poly·atom·ic | \ ˌpä-lē-ə-ˈtä-mik \

Definition of polyatomic 

: containing more than one and especially more than two atoms polyatomic molecules

First Known Use of polyatomic

1857, in the meaning defined above

History and Etymology for polyatomic

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The first known use of polyatomic was in 1857

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