'Xylem' definitions:

Definition of 'xylem'

From: WordNet
noun
The woody part of plants: the supporting and water- conducting tissue, consisting primarily of tracheids and vessels

Definition of 'Xylem'

From: GCIDE
  • Xylem \Xy"lem\, n. [Gr. xy`lon wood.] (Bot.) That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloem. [1913 Webster]