Mahogany is a dark, reddish-brown wood that comes from a tree also called a mahogany. You can also use this word for the color itself. A fancy dining room table might be made of mahogany.
If your best friend has rich brown hair with red highlights, feel free to compliment her on her mahogany locks. This color's name comes from mahogany timber, sturdy wood that's used to make high-end furniture, boats, and musical instruments, including guitars. The mahogany tree only grows in tropical regions, including parts of South America, Florida, and the West Indies. The word comes from the Spanish mahogani.