Fir wood is a type of wood that is commonly used in construction and furniture making. It is a softwood, meaning it is not as hard as other types of wood, but it is still strong and durable. The term 'fir wood' is derived from the Latin word for pine tree, which is where the wood is sourced from. The crossword solution for the term 'fir wood' is 'DEAL', which refers to the fact that fir wood is often sold in large quantities or 'deals'.