'tree swallow' definitions:
Definition of 'tree swallow'
(from WordNet)
noun
Bluish-green-and-white North American swallow; nests in tree cavities [syn: white-bellied swallow, tree swallow, Iridoprocne bicolor]
noun
Of Australia and Polynesia; nests in tree cavities [syn: tree swallow, tree martin, Hirundo nigricans]