A solvent with a comparatively high @R05273@ (or @D01697@), greater than ca. 15, and a sizable permanent @D01761@, that cannot donate suitably @L03432@ hydrogen atoms to form strong hydrogen bonds, e.g. dimethyl sulfoxide. The term (and its alternative '@P04708@') is a misnomer and is therefore discouraged. Such solvents are usually not @A00425@ but @P04916@ (and at most weakly @P04904@). In describing a solvent it is better to be explicit about its essential properties, e.g. dipolar and non-protogenic.