GNU Collaborative International Dictionary of English

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1.       
   ‖Liber (līˈbẽr), n. [L. See Libel.] (Bot.) The inner bark of plants, lying next to the wood. It usually contains a large proportion of woody, fibrous cells, and is, therefore, the part from which the fiber of the plant is obtained, as that of hemp, etc.
   
   [1913 Webster]
   
   Liber cells, elongated woody cells found in the liber.
   
   [1913 Webster]