kingbird

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various flycatchers of the genus Tyrannus found throughout the Americas, especially T. tyrannus.

from The Century Dictionary.

• noun A tyrant flycatcher, Tyrannus carolinensis, abundant in the United States (also called bee-martin), or some other species of the same genus, as the gray kingbird, Tyrannus dominicensis.
• noun Any bird of the family Tyrannidæ; any tyrant flycatcher.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) A small American bird (Tyrannus tyrannus, or Tyrannus Carolinensis), noted for its courage in attacking larger birds, even hawks and eagles, especially when they approach its nest in the breeding season. It is a typical tyrant flycatcher, taking various insects upon the wing. It is dark ash above, and blackish on the bead and tail. The quills and wing coverts are whitish at the edges. It is white beneath, with a white terminal band on the tail. The feathers on the head of the adults show a bright orange basal spot when erected. Called also bee bird, and bee martin. Several Southern and Western species of Tyrannus are also called king birds.
• noun The king tody. See under King.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A group of large insectivorous passerine birds of the genus Tyrannus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large American flycatcher