• WordNet 3.6
    • n Spinus in some classifications considered a subgenus of Carduelis: siskins and New World goldfinches
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Century Dictionary and Cyclopedia
    • n spinus An old name of some small bird which feeds on seeds, as a thistle-bird, linnet, siskin, or bunting.
    • n spinus Hence A genus of thistle-birds named by Koch in 1816, containing the linnet, the siskin or aberdevine, the goldfinch, the redpoll, and others, both of Europe and of America. In present usage, the siskin is Spinus spinus, the pine-finch is S. pinus, the goldfinch of Europe is S. carduelis, that of America is S. tristis, etc. The name wavers in application, and is more or less inexactly synonymous with several others, as Acanthis, Carduelis, Chrysomitris, Astragalinus, Ægiothus, Linaria, Linota, etc. See cuts under siskin and goldfinch.
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In literature:

Finch, pine, OR pine siskin (Spinus pinus).
"Wake-Robin" by John Burroughs