cereal (n.)

1832, "grass yielding edible grain and cultivated for food," originally an adjective (1818) "having to do with edible grain," from French céréale (16c., "of Ceres;" 18c. in grain sense), from Latin Cerealis "of grain," originally "of Ceres," from Ceres, Italic goddess of agriculture, from PIE *ker-es-, from root *ker- (2) "to grow." The application to breakfast food cereal made from grain is American English, 1899.

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Definitions of cereal from WordNet
cereal (n.)
grass whose starchy grains are used as food: wheat; rice; rye; oats; maize; buckwheat; millet;
Synonyms: cereal grass
cereal (n.)
foodstuff prepared from the starchy grains of cereal grasses;
Synonyms: grain / food grain
cereal (n.)
a breakfast food prepared from grain;
cereal (adj.)
made of grain or relating to grain or the plants that produce it;
cereal grasses
a cereal beverage