The Collaborative International Dictionary of English v.0.48:

Chickadee \Chick"a*dee`\, n. (Zool.)
   A small bird, the blackcap titmouse (Parus atricapillus),
   of North America; -- named from its note.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chickadee
    n 1: any of various small grey-and-black songbirds of North
         America