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English to English noun
| 1 |
a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk |  | Example: cow's milk contains about 4.7% lactose
source: wordnet30
| 2 |
Sugar of milk or milk sugar; a crystalline sugar present in milk, and separable from the whey by evaporation and crystallization. It has a slightly sweet taste, is dextrorotary, and is much less soluble in water than either cane sugar or glucose. Formerly called lactin. | | source: webster1913
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