Something that's fibrous is coarse and stringy, like thick yarn or twine. Some baskets are made of woven and twisted fibrous branches.
Fibrous things look like the fibers that are braided or twisted together to make a length of rope or jute. Many tree roots are fibrous, as are many vines and branches. A complicated hairdo may look like it's made of fibrous cords of hair. When you're eating something fibrous, it's hard to chew, like a chunk of fibrous meat in your stew or a fibrous broccoli stalk in your stir-fry. Fibrous comes from the Latin fibra, "fiber or filament."