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NAL Agricultural Thesaurus and Glossary
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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.
Definition Source
Forest Products Laboratory. 2010. Wood handbook - Wood as an engineering material. Gen. Tech. Rep. FPL-GTR-190. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory
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lignina