Definition

1. Noun:
   • A complex organic polymer: Lignin is a major structural component of many plants, especially in woody tissues. It is not a carbohydrate but a complex aromatic polymer that provides rigidity.
   • A binding agent in plant cell walls: It acts as a crucial binder that fills the spaces between cellulose fibers, hardening and strengthening the cell walls, which is essential for the plant's structural integrity and water transport.

Usage Examples

• Noun:
  • The decomposition of lignin in wood is a slow process carried out by specific fungi.
  • Paper manufacturing involves processes to remove lignin from wood pulp to prevent yellowing.
  • Lignin content is what makes the stems of trees and shrubs rigid.

Advanced Usage

• "Lignin degradation": Refers to the biochemical breakdown of lignin, a key process in carbon cycling and biofuel production.

  • Scientists are studying enzymes for more efficient lignin degradation.

• "Lignin biosynthesis": The metabolic pathway through which plants produce lignin.

  • Understanding lignin biosynthesis could help engineer crops with improved biomass.

Variants and Related Words

• Lignify (verb): To become wood or woody by the deposition of lignin.

  • As the plant matures, its stems begin to lignify.

• Lignocellulose (noun): The combination of lignin, cellulose, and hemicellulose that forms the structural basis of plant cell walls.

  • Lignocellulose is the most abundant renewable organic material on Earth.

Synonyms

• Woody polymer
• Cell wall binder

Related Phrases (Phrasal Verbs)

(Not commonly applicable for this technical noun)

Related Idioms

(Not commonly applicable for this technical noun)

Noun

1. a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants