tree swallow
1. of Australia and Polynesia; nests in tree cavities • Syn: tree martin, Hirundo nigricans • Hypernyms: swallow • Member Holonyms: Hirundo, genus Hirundo 2. bluish-green-and-white North American swallow; nests in tree cavities • Syn: white-bellied swallow, Iridoprocne bicolor • Hypernyms: swallow
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