/ Dictionary / Index T tree swallow: Meaning and Definition of Find definitions for: tree' swal"low Pronunciation: [key] a bluish-green and white swallow, Iridoprocne bicolor, of North America, that nests in tree cavities. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tree surgery tree swift Related Content Daily Word Quiz: rotund Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language