The Collaborative International Dictionary of English v.0.48:

Dicksoniaceae \Dicksoniaceae\ prop. n.
   1. A family of plants comprising the tree ferns; it includes
      the genera Dicksonia; Cibotium; Culcita; and
      Thyrsopteris.

   Syn: family Dicksoniaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Dicksoniaceae
    n 1: tree ferns: genera Dicksonia, Cibotium, Culcita, and
         Thyrsopteris elegans [syn: Dicksoniaceae, family
         Dicksoniaceae]