fiber, fibre -- (a slender and greatly elongated substance capable of being spun into yarn)
roughage, fiber -- (coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis)
fiber, fibre -- (any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber))
character, fiber, fibre -- (the inherent complex of attributes that determines a persons moral and ethical actions and reactions; "education has for its object the formation of character"- Herbert Spencer)
fiber, fibre, vulcanized fiber -- (a leatherlike material made by compressing layers of paper or cloth)