The type species Tyrannosaurus rex ( rex meaning 'king' in Latin), often called T. 'tyrant lizard' from Ancient Greek τύραννος ( túrannos) 'tyrant', and σαῦρος ( saûros) 'lizard') is a genus of large theropod dinosaur. Tyrannosaurus ( / t ɪ ˌ r æ n ə ˈ s ɔː r ə s, t aɪ-/ lit. (Gilmore, 1946) Bakker, Williams & Currie, 1988 (Gilmore, 1946) Charig in Appleby, Charig, Cox, Kermack & Tarlo, 1967
