lactin--prophetes.ai

lactin Chem.
  (ˈlæktɪn)
  Also -ine.
  [f. L. lact-, lac milk + -in.]
  = lactose.

1844 Fownes Chem. 364 Sugar of milk; lactine. 1858 Ibid. (ed. 7) 410 Lactin.

Oxford English Dictionary