The Collaborative International Dictionary of English v.0.48:

Serin \Ser"in\, n. [F. serin.] (Zool.)
   A European finch (Serinus hortulanus) closely related to
   the canary.
   [1913 Webster]

WordNet (r) 3.0 (2006):

serin
    n 1: any of various brown and yellow finches of parts of Europe