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.