Pyridine is a heterocyclic compound that is commonly used in organic chemistry as a solvent or as a reagent. Some synonyms for pyridine include azabenzene, azine, diazine, and azapyridine. Azabenzene is used to describe any heterocyclic compound that contains both a nitrogen atom and a benzene ring. Azine is typically used to describe a group of heterocyclic compounds that contain two nitrogen atoms in a six-membered ring. Diazine describes a group of heterocyclic compounds that contain two nitrogen atoms in a five-membered ring. Azapyridine is another synonym for pyridine that is commonly used in literature. All of these synonyms are used interchangeably to refer to the chemical compound pyridine.