Am"i*din (?), n. [Cf. F. amidine,
fr. amido? starch, fr. L. amylum, Gr. ? fine meal, neut.
of ? not ground at the mill, -- hence, of the finest meal; 'a
priv. + ?, ?, mill. See Meal.] (Chem.) Start
modified by heat so as to become a transparent mass, like horn. It is
soluble in cold water.