The Collaborative International Dictionary of English v.0.48:

Ule \U"le\ ([=u]"l[-e]), n. [Sp.] (Bot.)
   A Mexican and Central American tree (Castilloa elastica and
   Castilloa Markhamiana) related to the breadfruit tree. Its
   milky juice contains caoutchouc. Called also ule tree.
   [1913 Webster]