thumb|right|upright=0.5|Pyridine is a [[heterocyclic compound and the heteroatom is nitrogen.]]
thumb|right|upright=0.5|Pyridine is a [[heterocyclic compound and the heteroatom is nitrogen.]]
In chemistry, a heteroatom () is, strictly, any atom that is not carbon or hydrogen.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).