Aqueux

Aqueux is a French adjective meaning containing or consisting largely of water; in English, the cognate term is aqueous. It is used to describe liquids, solutions, and environments where water is the main solvent or medium.

In chemistry and pharmacology, an aqueous solution is one in which water is the solvent. The term is also used for phases and reactions conducted in water and for describing aqueous environments in laboratory and industrial contexts.

In biology and medicine, "milieu aqueux" refers to the water-based milieu of cells and extracellular fluids. The term extends to anatomical structures such as the aqueous humor, the clear fluid in the front part of the eye, essential for nutrient transport.

In English usage, "aqueous" contrasts with non-aqueous or organic solvents. Aqueous occurrence can indicate that water is the primary solvent, while "hydrous" describes water contained within a compound's structure.