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heteroatom

[het-uh-roh-at-uh m] /ˌhɛt ə roʊˈæt əm/
noun, Chemistry
1.
an atom other than carbon in the ring structure of a heterocyclic compound.
Origin
1895-1900
1895-1900; hetero- + atom
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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