Lyotropy is a term used to describe the variation in solubility or miscibility of a substance in different solvents. Synonyms for lyotropy include solvate effect or solvent effect, which refer to the ability of a solvent to dissolve a particular solute. A related term is hygroscopy, which refers to the ability of a substance to absorb moisture from the air. Lyotropy can also be referred to as solvent selectivity or solvent power, which describe a solvent's ability to selectively dissolve one substance over another. Other terms commonly used in this context include solubilization, aggregation, and micelle formation, all of which relate to the solubility of a substance in a particular solvent system.