Lignins are complex organic polymers that form an important part of plant cell walls. They provide structural support and maintain the integrity of the cell. There are several synonyms that can be used to refer to lignins in scientific literature. For instance, one can use the term lignocellulose, which is a combination of lignin and cellulose, the other component of plant cell walls. Another synonym that can be used is polyphenols, which are the chemical compounds that make up lignin. Additionally, the terms wood extractives or bark extractives can be used to refer to the lignin content in these plant materials. Irrespective of the synonym used, lignins are indispensable to the functioning of plant cells.