The American Heritage® Dictionary of the English Language, 4th Edition
n. An extremely fine synthetic fiber that can be woven into textiles with the texture and drape of natural-fiber cloth but with enhanced washability, breathability, and water repellancy.
n. Very fine synthetic fiber; cloth made of such fiber.
Word Usage
"The beauty of using microfiber is that its five-times more absorbent than cotton – which is extremely beneficial as bandanas are often used to absorb perspiration – and the material is naturally much more odor-resistant due to the nature of the material."