Solid wood is generally understood to be lumber or timber, that is pieces of wood sawn from a tree. This is distinct from engineered wood or manufactured wood products which include MDF, plywood, and OSB. Engineered wood is made of fibers or strands that are pressed or glued, there is more in the final stock than just wood (I.e., glue, lignin separated via heating and pressing).
Solid wood is generally understood to be lumber or timber, that is pieces of wood sawn from a tree. This is distinct from engineered wood or manufactured wood products which include MDF, plywood, and OSB. Engineered wood is made of fibers or strands that are pressed or glued, there is more in the final stock than just wood (I.e., glue, lignin separated via heating and pressing).