tree swallow trees·wal·low uncommon noun 1. bluish-green-and-white North American swallow; nests in tree cavities Synonymswhite-bellied swallowtree swallowIridoprocne bicolor 2. of Australia and Polynesia; nests in tree cavities Synonymstree swallowtree martinHirundo nigricans Related words Broader terms swallow Parts Hirundo WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
