The Collaborative International Dictionary of English v.0.48:

Begoniaceae \Begoniaceae\ n.
   a natural family of monoecious succulent herbs or shrubs of
   tropical and warm regions especially America.

   Syn: family Begoniaceae, begonia family.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Begoniaceae
    n 1: monoecious succulent herbs or shrubs of tropical and warm
         regions especially America [syn: Begoniaceae, family
         Begoniaceae, begonia family]