1. containing, consisting of, or resembling fibers.


  1. consisting of, containing, or resembling fibresfibrous tissue

1620s, from Modern Latin fibrosus, from Latin fibra (see fiber).


  1. Composed of or characterized by fibroblasts, fibrils, or connective tissue fibers.

  1. The parts of grains, fruits, and vegetables that contain cellulose and are not digested by the body. Fiber helps the intestines absorb water, which increases the bulk of the stool and causes it to move more quickly through the colon.
  2. One of the elongated, thick-walled cells, often occurring in bundles, that give strength and support to tissue in vascular plants. Fibers are one type of sclerenchyma cell.
  3. Any of the elongated cells of skeletal or cardiac muscle, made up of slender threadlike structures called myofibrils.
  4. The axon of a neuron.

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