The crossword solution for the term 'Piece of Firewood' is LOG, which is a three-letter word. A LOG is a piece of firewood that has been cut into a cylindrical shape and is usually used as fuel for a fire. Logs are typically made from hardwoods such as oak, maple, or hickory, and can be found in many different sizes. Logs are also commonly used in construction, as they can be used to build walls, floors, and other structures.