cereal: grass whose starchy grains are used as food: wheat; rice; rye; oats; maize; buckwheat; millet
grass: narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay
zircon: a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent