Heterocyclic

adj, noun

Definitions

Adjective
  1. 1
    Having atoms of two or more different elements in at least one of its rings. not-comparable
  2. 2
    Having one or more atoms other than carbon in at least one of its rings. not-comparable

    "Other highly effective heterocyclic substituents were pyrazinyl and quinoxalyl."

Adjective
  1. 1
    containing a closed ring of atoms of which at least one is not a carbon atom wordnet
Noun
  1. 1
    A heterocycle
  2. 2
    a compound containing a heterocyclic ring wordnet

Etymology

Etymology 1

From hetero- + cyclic.

Etymology 2

From hetero- + cyclic.

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