1) Substance derived from starch 2) The soluble matter of starch 
• (n.) Start modified by heat so as to become a transparent mass, like horn. It is soluble in cold water.
Am'i·din noun [ Confer French amidine , from amido... starch, from Latin amylum , Greek ... fine meal, neut. of ... not ground at the mill, -- hence, of the finest meal; 
the soluble matter of starch.