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

International Scientific Vocabulary

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The first known use of polyatomic was in 1857

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