What's the difference between i.e. and e.g.?
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- "to grow" (see crescent). The application to breakfast food cereal made from grain is American English, 1899.