heterocyclic heterocycle • heterocyclic compound · · · Info · Definitions · Synonyms · Characters · · heterocyclic · · Text Latin · · Script 12 · · Length 5 · · Syllables Definitions · · · (noun) a compound containing a heterocyclic ring. Synonyms: heterocyclic compound, heterocycle. · · Noun Definition 1 (adj) containing a closed ring of atoms of which at least one is not a carbon atom. · · Adjective Definition 1 Synonyms · · · heterocyclic compound · · Synonym 1 heterocycle · · Synonym 2 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079