"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
3. cereal
a breakfast food prepared from grain
"cereal" in the adjective sense
1. cereal
made of grain or relating to grain or the plants that produce it
"a cereal beverage"
"cereal grasses"
Source: WordNet® (An amazing lexical database of English)
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