starch: 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
polysaccharide: any of a class of carbohydrates whose molecules contain chains of monosaccharide molecules
alcove: a small recess opening off a larger room