An industrial process in which a substance to be dried or dehydrated is pumped as slurry or solid fragments over a heated revolving drum, the dried material afterwards being scraped off.
Origin
Late 19th century.
Definition of drum drying in US English:
drum drying
noun
An industrial process in which a substance to be dried or dehydrated is pumped as slurry or solid fragments over a heated revolving drum, the dried material afterwards being scraped off.