The Collaborative International Dictionary of English v.0.48:

Dilleniaceae \Dilleniaceae\ n.
   a natural family of chiefly tropical shrubs and trees and
   climbers having leathery leaves or flattened leaflike stems,
   including the genera Dillenia and Hibbertia.

   Syn: family Dilleniaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Dilleniaceae
    n 1: chiefly tropical shrubs and trees and climbers having
         leathery leaves or flattened leaflike stems: genera
         Dillenia and Hibbertia [syn: Dilleniaceae, family
         Dilleniaceae]