grid: a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material
plate: a sheet of metal or wood or glass or plastic
dicotyledones: comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae