In organic chemistry, a heteroatom (from Ancient Greek heteros, different, + atomos) is any atom that is not carbon or hydrogen. Usually, the term is used to indicate that non-carbon atoms have replaced carbon in the backbone of the molecular structure. Typical heteroatoms are nitrogen, oxygen, sulfur, phosphorus, chlorine, bromine, and iodine. In...
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http://en.wikipedia.org/wiki/Heteroatom
(from the article `chemical compound`) ...to identify atoms or groups of atoms within a molecule that are sites of comparatively high reactivity. A second type of reactive site results ...
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http://www.britannica.com/eb/a-z/h/44
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