noun (n)

• a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk

  gula comprising satu glukosa molekul dihubungkan ke sebuah galactose molekul; hanya berlaku dalam susu

  Example:
  Cow's milk contains about 4.7% lactose.
  

  Synonym:
  milk sugar
  

  source: wordnet30
• 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.

  gula susu susu atau gula; sebuah hablur gula hadir dalam susu, dan dapat dipisahkan dari oleh penguapan air dadih dan penghabluran. ada sedikit rasa manis, adalah dextrorotary, dan sangat sedikit dapat larut dalam air daripada yang glukosa gula atau tebu. aku dulu disebut lactin/ aku.

  source: webster1913