Looking into her soft gray eyes and face still beautiful, though wrinkled and colorless, Helen was conscious of a strange feeling of attraction toward her, a sort of unexplained affinity which women in trouble or distress often feel for one another, but which the sterner fiber of man's nature rarely admits of.
"The New Tenant"
E. Phillips Oppenheim
They listened jealously, attended as it were with every fiber of their bodies, as well as with their minds, to everything that was happening in this man-created world.
"The Way of Ambition"
Robert Hichens
Sometimes the word "fiber" is used by the mushroom growers in referring to the mycelium which appears in the spawn, or in the mushroom bed.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson