Definition of Fehling's solution in US English:

Fehling's solution

(also Fehling's reagent)


  • An alkaline solution of copper(II) sulfate and a tartrate, used in a laboratory test for sugars.

    • ‘Fructose gives a positive test with Fehling's solution too.’
    • ‘Some are remembered by association with useful substances, like Fehling's solution, or Glauber's salt.’
    • ‘The galactomannan was obtained from the alkali-soluble fraction by selective precipitation (Fehling's reagent).’


Late 19th century: named after the German chemist Hermann von Fehling (1812–85).


Fehling's solution

/ˈfāliNGz səˌlo͞oSH(ə)n/