noun.
Any of a group of enzymes that are present in saliva, pancreatic juice, and parts of plants and catalyze the hydrolysis of starch to sugar to produce carbohydrate derivatives.
The Century Dictionary and Cyclopedia
noun.
A ferment which will convert starch into dextrose: it occurs widely distributed in both the animal and the vegetable world. Same as diastase or amylolytic ferment.