Enzyme in certain yeasts and mammalian intestinal tracts that catalyzes converting lactose to glucose and galactose. Lactase tablets remove lactose from milk for people who are lactose intolerant. See next entry.
(lak´tās) β-D-galactosidase; an enzyme in the intestinal mucosa that hydrolyzes lactose, producing glucose and galactose. lactase deficiency the most common disaccharidase deficiency, reduced or absent lactase activity in walls of the intestine. The hereditary adult for... Found on http://www.encyclo.co.uk/local/21001
any of a group of enzymes found in the small intestine, liver, and kidney of mammals that catalyze the breakdown of lactose (milk sugar) into the ... [4 related articles] Found on http://www.britannica.com/eb/a-z/l/4