In almost all contexts, “solid wood” means a piece of a tree cut to shape. No engineered wood products to include plywood, OSB, particle board/pressboard/chipboard, MDF, glulam, etc. I will make allowances for shop-made laminations as you might do when edge gluind panels, gluing up boards to make thicker posts than are available, or to ease bending/forming.
In almost all contexts, “solid wood” means a piece of a tree cut to shape. No engineered wood products to include plywood, OSB, particle board/pressboard/chipboard, MDF, glulam, etc. I will make allowances for shop-made laminations as you might do when edge gluind panels, gluing up boards to make thicker posts than are available, or to ease bending/forming.