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Definition of Lactase

Lactase: Enzyme that breaks down the milk sugar lactose into glucose and galactose. Persons with a deficiency of lactase (alactasia) in the gut can develop abdominal cramping and diarrhea after ingesting milk products.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=6200
Last Editorial Review: 8/28/2013

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