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Preferred Term:

lignin

Definition:
The second most abundant constituent of wood, located principally in the secondary wall and the middle lamella, which is the thin cementing layer between wood cells. Chemically, it is an irregular polymer of substituted propylphenol groups, and thus, no simple chemical formula can be written for it.
Concept Schemes:
NALT Core
https://lod.nal.usda.gov/nalt
Broader Concept:
URI:
https://lod.nal.usda.gov/nalt/50048
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RDF/XMLCreated 2006-01-19, last modified 2019-02-19