lig·nin /ˈlɪgnən/
  木質素
  lig·nin /ˈlɪgnən/ 名詞
  Lig·nin n.  Bot. A substance characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents.
  Note: ☞ Recent authors have distinguished four forms of this substance, naming them lignose, lignin, lignone, and lignireose.
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  lignin
       n : a complex polymer; the chief non-carbohydrate constituent of
           wood; binds to cellulose fibers to harden and strengthen
           cell walls of plants