a bluish-green and white swallow, Iridoprocne bicolor, of North America, that nests in tree cavities.
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Origin of tree swallow
An Americanism dating back to 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for tree swallow
The peasants call it tree-swallow, but its name is something else.In Midsummer Days and Other Tales|August Strindberg