Term: arrowroot: a nutritive starch obtained from the root of the arrowroot plant
Broader: 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 | Unrelated: microspore: smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte
Broader: 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 | Unrelated: ratchet wheel: toothed wheel held in place by a pawl or detent and turned by a lever