1. 
   Sclerogen
   Scler'o·gen noun [ Greek sklhro`s hard + -gen .] (Botany) The thickening matter of woody cells; lignin.
   Found op http://www.encyclo.co.uk/webster/S/33
   
   
2. 
   sclerogen
   <botany> The thickening matter of woody cells; lignin. ... Origin: Gr. Sklhros hard + -gen. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?sclerogen
   
   
3. 
   Sclerogen
   • (n.) The thickening matter of woody cells; lignin.
   Found op http://thinkexist.com/dictionary/meaning/sclerogen/
   
   

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