dei·no·don \ˈdīnəˌdän\noun Usage: capitalized Etymology: New Latin, from din- + -odon : a genus of immense carnivorous saurischian dinosaurs of the upper Cretaceous of Alberta that with Tyrannosaurus and related genera constitutes a distinct family chiefly of No. America • dei·no·dont\-ˌdänt\adjective or noun