Source : Webster's Revised Unabridged Dictionary (1913)

Siskin \Sis"kin\, n. [Dan. sisgen; cf. Sw. siska, G. zeisig, D.
   sijsje; of Slav. origin; cf. Pol. czy?.] (Zo["o]l.)
   (a) A small green and yellow European finch ({Spinus spinus},
       or {Carduelis spinus}); -- called also {aberdevine}.
   (b) The American pinefinch ({S. pinus}); -- called also {pine
       siskin}. See {Pinefinch}.

   Note: The name is applied also to several other related
         species found in Asia and South America.

   {Siskin green}, a delicate shade of yellowish green, as in
      the mineral torbernite.

Pinefinch \Pine"finch`\, n. (Zo["o]l.)
   (a) A small American bird ({Spinus, or Chrysomitris,
       spinus}); -- called also {pine siskin}, and {American
       siskin}.
   (b) The pine grosbeak.

Source : WordNet®

pine siskin
     n : small finch of North American coniferous forests [syn: {pine
         finch}, {Spinus pinus}]