cerealyoudaoicibaDictYouDict
cereal: [19] Cereal is a comparatively modern introduction of the Latin adjective cereālis ‘of grain’, which was derived from the name of Cerēs, the Roman goddess of agriculture (identified with Greek Demeter). It has, needless to say, no connection with serial (see SERIES).
cereal (n.)youdaoicibaDictYouDict
1832, "grass yielding edible grain," 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- (3) "to grow" (see crescent). The application to breakfast food cereal made from grain is American English, 1899.