plural of 8x8

(automotive) an eight-wheeled vehicle with eight-wheel drive, each wheel has powered drive. (Abbreviation of 8 drive wheels on 8 wheels.)

The recommendation that a person should drink eight servings of eight ounces of water each day.

(automotive) an eight-wheeled vehicle with eight-wheel drive and eight-wheeled steering, each wheel has powered drive, and each axle is steerable. (Abbreviation of 8 wheel steering with 8 drive wheels on 8 wheels.)

plural of 8x8x8