ty·ran·no·sau·rid 
(tĭ-răn′ə-sôrĭd, tī-)
(tĭ-răn′ə-sôrĭd, tī-)n.
Any of various theropod dinosaurs of the family Tyrannosauridae of the Cretaceous Period, characterized by short deep jaws with large teeth, long hind limbs, and short forelimbs, and including T. rex. Also called tyrannosaur.
[From New Latin Tyrannosauridae, family name, from Tyrannosaurus, type genus; see TYRANNOSAURUS.]
ty·ran′no·saurid adj.