The Collaborative International Dictionary of English v.0.48:

Casuarinaceae \Casuarinaceae\ n.
   a natural family of plants having only one genus,
   Casuarina.

   Syn: family Casuarinaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Casuarinaceae
    n 1: one genus: genus Casuarina [syn: Casuarinaceae, family
         Casuarinaceae]