RANCIDITY • FREE TRANSLATOR.ORG • Definition of Rancidity

... largely employed in pure cultures in American dairies, and in Denmark certain butters are said to keep fresh much longer owing to the use of pure cultures and the treatment employed to suppress the forms which cause rancidity. Quite distinct is the search for the germs which cause undesirable changes, or "diseases"; and great strides have been made in discovering the bacteria concerned in rendering milk "ropy," butter "oily" and "rancid," ...

— Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 - "Baconthorpe" to "Bankruptcy" • Various