Tyrannosaurus (/t??ræn?'s?r?s/ or /ta??ræn?'s?r?s/;
meaning tyrant lizard",
from Greek tyrannos (t??a????) meaning "tyrant," and sauros (sa????) meaning "lizard") is a genus of coelurosaurian theropod dinosaur.
The species Tyrannosaurus rex (rex meaning "king" in Latin), commonly abbreviated to T. rex, is a fixture in popular culture. It lived throughout what is now western North America, at the time an island continent termed Laramidia, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 67 to 65.5 million years ago. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.