IPA: /ˈwɔːlˌbɔːrd/
KK: /ˈwɔːlˌbɔːrd/
A type of board made from materials like gypsum or wood pulp, used to cover walls and ceilings in buildings.
The contractor installed wallboard in the new office to create smooth surfaces for painting.
Wallboard is formed from "wall" (from Old English *weall*, meaning a structure that encloses or divides) and "board" (from Old English *bord*, meaning a flat piece of material). The word "wallboard" refers to a flat material used to construct or cover walls.
Think of a 'wall' as a structure that encloses and a 'board' as a flat piece of material — together, they create wallboard, which is used to build or cover walls.