乳醣（粵拼：jyu⁵ tong⁴）（英文：Lactose），又寫乳糖，係醣一種，雙醣一種，見於奶入便。乳醣分子，係葡萄醣同埋半乳醣兩隻單醣化合而成。人體入便，可以畀乳糖水解酶分解成兩種單糖。奶中乳醣重量，佔百分之二到八，唔同物種會有差異。乳醣嘅分子式係C12H22O11。
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