The Collaborative International Dictionary of English v.0.48:

Xenicidae \Xe*ni"ci*dae\, pr. n.
   A natural family of birds comprising the New Zealand wrens,
   synonymous with Acanthisittidae.

   Syn: family Xenicidae, Acanthisittidae, family
        Acanthisittidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Xenicidae
    n 1: alternative names for the family comprising the New Zealand
         wrens [syn: Xenicidae, family Xenicidae,
         Acanthisittidae, family Acanthisittidae]