Definitions of lignin

  1. a complex polymer; the chief non-carbohydrate constituent of wood; binds to cellulose fibers to harden and strengthen cell walls of plants Scrapingweb Dictionary DB
  2. A substance characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents. Webster Dictionary DB
  3. The most abundant natural aromatic organic polymer found in all vascular plants. Lignin together with cellulose and hemicellulose are the major cell wall components of the fibers of all wood and grass species. Lignin is composed of coniferyl, p-coumaryl, and sinapyl alcohols in varying ratios in different plant species. (From Merck Index, 11th ed) Medical Dictionary DB
  4. A substance, C19H18O8, resembling cellulose, present in vegetable fiber and wood-cells. A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
  5. The substance which, modified by cellulose, causes the thickening of plant cell-walls, and so forms wood. A dictionary of scientific terms. By Henderson, I. F.; Henderson, W. D. Published 1920.
  6. [Latin] A complex substance which, associated with cellulose, causes the thickening of plant cell-walls, and so forms wood. na
  7. Ligneous or woody fibre; the fibrous structure of vegetable substances. Medical Lexicon. A Dictionary of Medical Science
  8. A body resembling cellulose lining the interior of woody vegetable cells. na
  9. A substance present in cell walls, which is very resistant to chemical reagents. It contains aromatic groups and responds to the lignin reaction. Appleton's medical dictionary.