bombax

from WordNet (r) 3.0 (2006)

Bombax
    n 1: trees of chiefly South America [syn: {Bombax}, {genus
         Bombax}]

from The Collaborative International Dictionary of English v.0.48

Bombax \Bom"bax\, n. [LL., cotton. See {Bombast}, n.] (Bot.)
   A genus of trees, called also the {silkcotton tree}; also, a
   tree of the genus Bombax.
   [1913 Webster]