\Ga*lac"tin\, n. [Gr. ?, ?, milk. Cf. {Lactin}.]
(Chem.)
   (a) An amorphous, gelatinous substance containing
       nitrogen, found in milk and other animal fluids. It
       resembles peptone, and is variously regarded as a
       coagulating or emulsifying agent.
   (b) A white waxy substance found in the sap of the South
       American cow tree ({Galactodendron}).
   (c) An amorphous, gummy carbohydrate resembling gelose,
       found in the seeds of leguminous plants, and yielding
       on decomposition several sugars, including galactose.