[het-er-uh-sahy-klik, -sik-lik] /ˌhɛt ər əˈsaɪ klɪk, -ˈsɪk lɪk/

adjective, Chemistry.
of or relating to the branch of chemistry dealing with compounds in which at least one of the ring members is not a carbon atom (contrasted with ).
noting such compounds, as ethylene oxide, C 2 H 4 O.
/ˌhɛtərəʊˈsaɪklɪk; -ˈsɪk-/
(of an organic compound) containing a closed ring of atoms, at least one of which is not a carbon atom Compare homocyclic

heterocyclic het·er·o·cy·clic (hět’ə-rō-sī’klĭk, -sĭk’lĭk)
Containing more than one kind of atom joined in a ring.
(hět’ə-rō-sī’klĭk, -sĭk’lĭk)
Of or relating to a compound containing a closed ring structure made of more than one kind of atom. Pyridine (C5H5N), for example, is a heterocyclic compound, as its ring contains five carbon atoms and one nitrogen atom. Compare homocyclic.


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