From Longman Dictionary of Contemporary Englishhardboardhard‧board /ˈhɑːdbɔːd $ ˈhɑːrdbɔːrd/ noun [uncountable] TIMa material made from small pieces of wood pressed together
Examples from the Corpus
hardboard• Now you have to make your own out of concrete and hardboard.• There were just hardboard partitions between the rehearsal rooms - cubicles really.• They also supply small metal clips to secure items between picture glass and a sheet of hardboard or thin plywood.• Finish the semi-circle with a strip of hardboard nailed to the outer edges of the plywood arch.• Summerchild taps on the hardboard divisions to demonstrate their solidity and stops at once when they ring hollow.• Alternately, a piece of light green paper might be glued over the hardboard.• All three types are good but try to avoid the cheaper plastic-sided drawers with a thin hardboard base.• If you are using hardboard or plywood, cut each of the four sides separately and join them with glue and nails. 