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