Cereal

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early 19th century (as an adjective): from Latin cerealis, from Ceres.

wiktionary

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Borrowed from French céréale(“having to do with cereal”), from Latin Cerealis(“of or relating to Ceres”), from Ceres(“Roman goddess of agriculture”), from Proto-Indo-European *ḱer-(“grow”), from which also Latin sincerus (English sincere) and Latin crēscō(“grow”) (English crescent).

etymonline

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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.