blockboard

From block +‎ board.

blockboard (countable and uncountable, plural blockboards)

1. A compound wood board consisting of nearly square strips of softwood placed side by side and sandwiched between veneer panels, often of hardwood.
   • 1951 May, “British Railways Standard Coaches”, in Railway Magazine, pages 327-328:

     Compartment and corridor partitions are of blockboard, with appropriate decorative veneers to suit the varied interior decoration.

• laminboard, battenboard, block plywood, blockplywood

• plywood, chipboard