Syllabification: xy·lem
Pronunciation: ˈzīləm
noun
Definition: The vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem.
Origin: late 19th century: from Greek xulon ‘wood’ + the passive suffix –ēma
Source: http://www.oxforddictionaries.com/definition/american_english/xylem