Pharmacologic Substance
fiber Audio
[ fy-ber ]
Effect:
Metabolic Activity Alteration
May Prevent:
Constipation; Nutrition Disorders
May Treat:
Nutrition Disorders
Definitions related to fiber:
  • A substance found in plant foods that the body can't digest.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • An elongated, tapering, generally thick-walled sclerenchyma cell of vascular plants; its walls may or may not be lignified.
    U.S. FDA Glossary
    U.S. Food & Drug Administration, 2021
  • Some foods contain fiber, which is a tough complex carbohydrate. Fiber may be Partly soluble: It dissolves in water, and the body may be able to digest some of it.
    Merck Manuals
    Merck & Co., Inc., 2025
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.