one that has passed the peak of effectiveness or popularity <as an old-time big-city boss, he's become something of a dinosaur in today's political world>
something or someone that is unusually large and powerful <not that his small lawn needed such a dinosaur, but he bought a riding mower anyway> Synonyms behemoth
Seen & Heard
What made you want to look up dinosaur? Please tell us where you read or heard it (including the quote, if possible).