A colorless, aromatic, flammable liquid chemical derived from coal and petroleum; used as a solvent, fuel, and in manufacturing synthetic resins and pesticides.

First of the ten Heavenly Stems; used to indicate the first position in a sequence or rank, often equivalent to "A" or "I" in English lists; ancient Chinese compass point (75°)

(bound form) an acyl group in chemistry; the radical left after removing one or more hydroxyl groups from an oxygen-containing acid

chlorine (element Cl); a toxic, yellow-green gas with a strong odor used for bleaching and disinfecting