Solid hardwood floors are just that — they're made from solid wood. Each board of solid hardwood flooring is made from a single piece of hardwood that's about 3/4 of an inch thick. Because it's so thick it can be sanded down and refinished for however long the flooring is in the house.
What's the difference when it comes to solid vs. engineered hardwood? An engineered wood floor is constructed of layers of both hardwood and plywood, where solid hardwood is a solid piece of wood with no layers.
Prefinished Solid Acacia
Prefinished Solid Hickory