ADJ

rectangular, square
regular

GRID + NOUN

line, pattern, square, system
The artist drew a set of grid lines over the area to be painted

GRID + NOUN

line, reference, square
The grid lines on the map run north-south. An Ordnance Survey grid reference gives the position of a place to within 100 metres

ADJ

national
electricity

GRID + NOUN

system
Power can be fed from wind generators into the electricity grid system