softener — Chemistry. any admixture to a substance for promoting or increasing its softness, smoothness, or plasticity. water softener.
Four-or-more syllable rhymes
water softener — any of a group of substances that when added to water containing calcium and magnesium ions cause the ions to precipitate or change their usual properties: used in the purification of water for the laboratory, and for giving water more efficient sudsing ability with soap.
