Definition of "Starch" :

noun: a commercial preparation of starch that is used to stiffen textile fabrics in laundering

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

verb: stiffen with starch

"Starch clothes."