The Collaborative International Dictionary of English v.0.48:

Chaffinch \Chaf"finch\, n. [Cf. Chiff-chaff.] (Zool.)
   A bird of Europe (Fringilla c[oe]lebs), having a variety of
   very sweet songs, and highly valued as a cage bird; -- called
   also copper finch.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chaffinch
    n 1: small European finch with a cheerful song [syn:
         chaffinch, Fringilla coelebs]