ˈfāliŋ- noun
or fehling's solution -ŋz-
Usage: usually capitalized F
Etymology: after Hermann Fehling died 1885 German chemist
: a blue solution that is made by mixing an alkaline solution of Rochelle salt with a solution of copper sulfate and that is used as a mild oxidizing agent especially in testing for glucose and other reducing sugars and for aldehydes, being itself reduced to red cuprous oxide which precipitates