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The Collaborative International Dictionary of English v.0.48 (gcide)

Snowbird \Snow"bird\, n. (Zool.)
(a) An arctic finch ({Plectrophenax nivalis} syn.
{Plectrophanes nivalis}) common, in winter, both in
Europe and the United States, and often appearing in
large flocks during snowstorms. It is partially white,
but variously marked with chestnut and brown. Called also
{snow bunting}, {snowflake}, {snowfleck}, and
{snowflight}.
(b) Any finch of the genus {Junco} which appears in flocks in
winter time, especially {Junco hyemalis} in the Eastern
United States; -- called also {blue snowbird}. See
{Junco}.
(c) The fieldfare. [Prov. Eng.]
[1913 Webster]


Junco \Jun"co\, n. (Zool.)
Any bird of the genus {Junco}, which includes several species
of North American finches; -- called also {snowbird}, or
{blue snowbird}.
[1913 Webster]