"cereal" in the noun sense
1. cereal, cereal grass
grass whose starchy grains are used as food: wheat rice rye oats maize buckwheat millet
2. grain, food grain, cereal
foodstuff prepared from the starchy grains of cereal grasses
a breakfast food prepared from grain
"cereal" in the adjective sense
made of grain or relating to grain or the plants that produce it
"a cereal beverage"
Source: WordNet® (An amazing lexical database of English)
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