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Definition of Soft water
1. Noun. Water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap).
Definition of Soft water
1. Noun. (chemistry) water with a low concentration of dissolved minerals, especially calcium, making it easier to lather with soap ¹
¹ Source: wiktionary.com
Medical Definition of Soft water
1. Water lacking those ions, such as Magnesium and Calcium, that form insoluble salts with fatty acids, so that ordinary soap will lather easily in it. (05 Mar 2000)