The Collaborative International Dictionary of English v.0.48:

Ardeidae \Ardeidae\ n.
   1. 1 a familu of wading birds incuding the herons, egrets,
      night herons, and bitterns.

   Syn: family Ardeidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Ardeidae
    n 1: herons; egrets; night herons; bitterns [syn: Ardeidae,
         family Ardeidae]