| 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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