1. rough wooden boards or planks used in the construction or repair of barns and farm buildings
Usage: often used in plural; typically refers to unfinished or weathered wood
2. wood salvaged from old barns, often used decoratively or in rustic construction
Usage: informal; increasingly common in interior design and reclaimed building materials

Examples

• The farmer reinforced the barn's walls with sturdy barnboard.
• Reclaimed barnboard has become popular for rustic home décor.
• The contractor sourced authentic barnboard from a 19th-century structure.
• Weathered barnboard gives the cabin an authentic country appearance.
• She used old barnboard to build shelving in the farmhouse kitchen.