The Collaborative International Dictionary of English v.0.48:

Cannabidaceae \Cannabidaceae\ n.
   1. a grouping of plants containing two genera of erect or
      twining wind-pollinated herbs, the genera Cannabis and
      Humulus; this term is not used in all classifications;
      in some the genus Cannabis is placed in the family
      Moraceae and the genus Humulus in the family
      Urticaceae.

   Syn: family Cannabidaceae, hemp family.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cannabidaceae
    n 1: two genera of erect or twining herbs that are pollinated by
         the wind, including the genera Cannabis and Humulus; term
         not used in all classifications; in some the genus Cannabis
         is placed in the family Moraceae and the genus Humulus in
         the family Urticaceae [syn: Cannabidaceae, family
         Cannabidaceae, hemp family]