1.  cereal(n = noun.plant) cereal grass - grass whose starchy grains are used as food: wheat; rice; rye; oats; maize; buckwheat; millet;
is a kind of grass
has particulars: oat, barley, rice, rice grass, ricegrass, bulrush millet, cattail millet, pearl millet, pennisetum americanum, pennisetum glaucum, rye, secale cereale, millet, grain, wheat, corn, indian corn, maize, zea mays, corn, wild rice, zizania aquatica
Derived form adjective cereal₁

2.  cereal(n = noun.food) food grain, grain - foodstuff prepared from the starchy grains of cereal grasses;
is a kind of food product, foodstuff
has particulars: corn, edible corn, grist, groats, millet, barley, barleycorn, buckwheat, wheat, wheat berry, oat, rice, indian rice, wild rice, malt
Derived form adjective cereal₁

3.  cereal(n = noun.food) - a breakfast food prepared from grain;
is a kind of breakfast food
has particulars: pablum, hot cereal, cold cereal, dry cereal
Derived form adjective cereal₁

   cereal(a = adj.pert) - made of grain or relating to grain or the plants that produce it; "a cereal beverage"; "cereal grasses"
Derived forms noun cereal₃, noun cereal₂, noun cereal₁

   Of or pertaining to the grasses which are cultivated for their edible seeds (as wheat, maize, rice, etc.), or to their seeds or grain. [1913 Webster]

   Any grass cultivated for its edible grain, or the grain itself; -- usually in the plural. [1913 Webster]

cereal, n. & adj
--n.
1 (usu. in pl.) a any kind of grain used for food. b any grass producing this, e.g. wheat, maize, rye, etc.
2 a breakfast food made from a cereal and requiring no cooking.
--adj. of edible grain or products of it.

Etymology:
L cerealis f. Ceres goddess of agriculture

N  food, eating, deglutition, gulp, epulation, mastication, manducation, rumination, gluttony, hippophagy, ichthyophagy, (appetite), mouth, jaws, mandible, mazard, gob, chops, drinking, potation, draught, libation, carousal, drunkenness, food, pabulum, aliment, nourishment, nutriment, sustenance, sustentation, sustention, nurture, subsistence, provender, corn, feed, fodder, provision, ration, keep, commons, board, commissariat, prey, forage, pasture, pasturage, fare, cheer, diet, dietary, regimen, belly timber, staff of life, bread, bread and cheese, comestibles, eatables, victuals, edibles, ingesta, grub, grubstake, prog, meat, bread, bread stuffs, cerealia, cereals, viands, cates, delicacy, dainty, creature comforts, contents of the larder, fleshpots, festal board, ambrosia, good cheer, good living, beef, bisquit, bun, cornstarch, cookie, cooky, cracker, doughnut, fatling, hardtack, hoecake, hominy, mutton, pilot bread, pork, roti, rusk, ship biscuit, veal, joint, piece de resistance, roast and boiled, remove, entremet, releve, hash, rechauffe, stew, ragout, fricassee, mince, pottage, potage, broth, soup, consomme, puree, spoonmeat, pie, pasty, volauvent, pudding, omelet, pastry, sweets, kickshaws, condiment, appetizer, hors d'oeuvre, main course, entree, alligator pear, apple, apple slump, artichoke, ashcake, griddlecake, pancake, flapjack, atole, avocado, banana, beche de mer, barbecue, beefsteak, beet root, blackberry, blancmange, bloater, bouilli, bouillon, breadfruit, chop suey, chowder, chupatty, clam, compote, damper, fish, frumenty, grapes, hasty pudding, ice cream, lettuce, mango, mangosteen, mince pie, oatmeal, oyster, pineapple, porridge, porterhouse steak, salmis, sauerkraut, sea slug, sturgeon ("Albany beef"), succotash, supawn, trepang, vanilla, waffle, walnut, table, cuisine, bill of fare, menu, table d'hote, ordinary, entree, meal, repast, feed, spread, mess, dish, plate, course, regale, regalement, refreshment, entertainment, refection, collation, picnic, feast, banquet, junket, breakfast, lunch, luncheon, dejeuner, bever, tiffin, dinner, supper, snack, junk food, fast food, whet, bait, dessert, potluck, table d'hote, dejeuner a la fourchette, hearty meal, square meal, substantial meal, full meal, blowout, light refreshment, bara, chotahazri, bara khana, mouthful, bolus, gobbet, morsel, sop, sippet, drink, beverage, liquor, broth, soup, potion, dram, draught, drench, swill, nip, sip, sup, gulp, wine, spirits, liqueur, beer, ale, malt liquor, Sir John Barleycorn, stingo, heavy wet, grog, toddy, flip, purl, punch, negus, cup, bishop, wassail, gin, coffee, chocolate, cocoa, tea, the cup that cheers but not inebriates, bock beer, lager beer, Pilsener beer, schenck beer, Brazil tea, cider, claret, ice water, mate, mint julep, near beer, 2 beer, non- alcoholic beverage, eating house, diner, hippophage, glutton, eatable, edible, esculent, comestible, alimentary, cereal, cibarious, dietetic, culinary, nutritive, nutritious, gastric, succulent, potable, potulent, bibulous, omnivorous, carnivorous, herbivorous, granivorous, graminivorous, phytivorous, ichthyivorous, omophagic, omophagous, pantophagous, phytophagous, xylophagous, across the walnuts and the wine, blessed hour of our dinners!, now good digestion wait on appetite, and health on both!, who can cloy the hungry edge of appetite?.

cereal bowl, cereal box, cereal grass, cereal oat, cold cereal, dry cereal, hot cereal