Is “Grids” a Scrabble word?

1.A rectangular array of squares or rectangles of equal size, such as in a crossword puzzle.

2.A system for delivery of electricity, consisting of various substations, transformers and generators, connected by wire.

3.A system or structure of distributed computers working mostly on a peer-to-peer basis, used mainly to solve single and complex scientific or technical problems or to process data at high speeds (as in clusters).

1.To mark with a grid.

2.To assign a reference grid to.