Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
"Hule" Definition
noun
A shrubby composite plant, Parthenium argentatum, which has a milky juice containing considerable caoutchouc. The latter is usually obtained by grinding up the plants and extracting with chemicals.
Source: Century Dictionary
Any one of several species of Central American rubber-producing trees of the genus Castilla, especially C. elastica.
Source: Century Dictionary
Same as ule.
Source: Century Dictionary