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[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 cyclic compounds in which at least one of the ring members is not a carbon atom (contrasted with homocyclic).
noting such compounds, as ethylene oxide, C 2 H 4 O.
Origin of heterocyclic
First recorded in 1895-1900; hetero- + cyclic
Related forms
[het-er-uh-sahy-kuh l] /ˈhɛt ər əˌsaɪ kəl/ (Show IPA),
noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for heterocyclic


/ˌhɛtərəʊˈsaɪklɪk; -ˈsɪk-/
(of an organic compound) containing a closed ring of atoms, at least one of which is not a carbon atom Compare homocyclic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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heterocyclic in Medicine

heterocyclic het·er·o·cy·clic (hět'ə-rō-sī'klĭk, -sĭk'lĭk)
Containing more than one kind of atom joined in a ring.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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heterocyclic in Science
  (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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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