n.1 a framework of spaced parallel bars; a grating.
2 a system of numbered squares printed on a map and forming the basis of map references.
3 a network of lines, electric-power connections, gas-supply lines, etc.
4 a pattern of lines marking the starting-places on a motor-racing track.
5 the wire network between the filament and the anode of a thermionic valve etc.
6 an arrangement of town streets in a rectangular pattern.
Phrases and idioms:
grid bias Electr. a fixed voltage applied between the cathode and the control grid of a thermionic valve which determines its operating conditions.
Derivatives:
gridded adj.
Etymology: back-form. f. GRIDIRON