definition of starch
Princeton's WordNet(2.00 / 1 vote)Rate this definition: 1  starch, amylum(noun) a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice; an important foodstuff and used otherwise especially in adhesives and as fillers and stiffeners for paper and textiles.