Webster's English Dictionary

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xylem

Cross references:
  1. phloem                
 
xy.lem \'zi--l*m, -.lem\ n [G, fr. Gk xylon] : a complex tissue in the 
   vascular system of higher plants consisting of v essels, tracheids, or both 
   usu. together with wood fibers and parenchyma cells, functioning chiefly in 
   conduction but also in support and storage, and typically constituting the 
   woody element (as of a plant stem)