noun
heterocyclic compound
Technical term in chemistry for a cyclic compound containing at least one atom other than carbon in the ring.
ピリジンは代表的な複素環式化合物の一つです。
Pyridine is one of the representative heterocyclic compounds.
Compound of 複素環式 (heterocyclic) + 化合物 (compound). The exact historical derivation is uncertain; the term is a modern scientific coinage.