In chemistry and mathematics, referring to a cyclic compound or structure where the ring atoms are all of the same type, typically carbon.
From Greek eu- (well) + kyklos (circle), describing cycles or rings that are 'well-formed' with homogeneous ring composition, contrasting with heterocyclic compounds that contain different types of atoms in the ring.
Benzene is the most famous eucyclic compound—it's a perfect ring of six carbon atoms, and when chemists first determined its structure in 1865, it was so elegant that it inspired the chemist Kekulé to dream of a snake biting its own tail.
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