The Collaborative International Dictionary of English v.0.48:

Waxwing \Wax"wing`\, n. (Zool.)
   Any one of several species of small birds of the genus
   Ampelis, in which some of the secondary quills are usually
   tipped with small horny ornaments resembling red sealing wax.
   The Bohemian waxwing (see under Bohemian) and the cedar
   bird are examples. Called also waxbird.
   [1913 Webster]

WordNet (r) 3.0 (2006):

waxwing
    n 1: brown velvety-plumaged songbirds of the northern hemisphere
         having crested heads and red waxy wing tips