For Lactase Deficiency we have terms and definitions in 2 topics. The topics are Health and Medical.

Lack of an enzyme made by the small intestine called lactase, which prevents the body from digesting lactose (a sugar found in milk and milk products) properly.
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An inherited disorder in which a person does not have the enzyme lactase, which breaks down lactose (the sugar found in dairy products); lactase deficiency leads to lactose intolerance, which means the inability to digest lactose
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