The Collaborative International Dictionary of English v.0.48:

Agavaceae \Agavaceae\ n.
   1. 1 a natural family of chiefly tropical and xerophytic
      plants: includes Dracenaceae (Dracaenaceae); comprises
      plants that in some classifications are divided between
      the Amaryllidaceae and the Liliaceae.

   Syn: family Agavaceae, agave family, sisal family.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Agavaceae
    n 1: chiefly tropical and xerophytic plants: includes
         Dracenaceae (Dracaenaceae); comprises plants that in some
         classifications are divided between the Amaryllidaceae and
         the Liliaceae [syn: Agavaceae, family Agavaceae, agave
         family, sisal family]