Definition of "tyrannus" []

• The name-giving genus of Tyrannidæ, formerly loosely extended to embrace most of the larger species then known (so named from their irritable or irascible disposition and their tendency to tyrannize over other birds), now restricted to a few large stout flycatchers like the common king-bird or bee-martin of the United States, T. tyrannus, T. pipiri, T. intrepidus, or T. carolinensis. (noun)

The Century Dictionary (Public Domain)

• "The self-proclaimed "emperors" were not considered to be emperors at all by most of the citizens; in fact, the Romans had a separate name for men like Domitianus, tyrannus, meaning anyone who had come to power illegitimately."
• "The powerful eagles Spizaetus tyrannus, Morphnus guianensis and Harpia harpyja, the critically endangered blue knobbed curassow Crax alberti, six species of macaws Ara ambigua, A. militaris, A. ararauna, A. macao, A. chloroptera, and A. severa, among others."
• "Bird surveys have recorded 306 species, including black-hawk eagle Spizaetus tyrannus, ocellated crake Micropygia schomburgii, greater rhea Rhea americana, Brazilian merganser Mergus octocetaceus (CR) and dwarf tinamu Taoniscus nanus (VU)."