The Collaborative International Dictionary of English v.0.48:

Platanus \Plat"a*nus\, n. [See Plane the tree.] (Bot.)
   A genus of trees; the plane tree.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Platanus
    n 1: genus of large monoecious mostly deciduous trees: London
         plane; sycamore [syn: Platanus, genus Platanus]