Definition of fibre

• n. - One of the delicate, threadlike portions of which the tissues of plants and animals are in part constituted; as, the fiber of flax or of muscle.
• n. - Any fine, slender thread, or threadlike substance; as, a fiber of spun glass; especially, one of the slender rootlets of a plant.
• n. - Sinew; strength; toughness; as, a man of real fiber.
• n. - A general name for the raw material, such as cotton, flax, hemp, etc., used in textile manufactures.
• - A tough vegetable fiber used as a substitute for bristles in making brushes. The piassava and the ixtle are both used under this name.