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heteroatom

[het-uh-roh-at-uh m]
noun Chemistry.
  1. an atom other than carbon in the ring structure of a heterocyclic compound.
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Origin of heteroatom

First recorded in 1895–1900; hetero- + atom
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018