Merriam-Webster Online Dictionary
dinosaur (noun)1.
any of a group (Dinosauria) of extinct often very large chiefly terrestrial carnivorous or herbivorous reptiles of the Mesozoic era
2.
any of various large extinct reptiles (as ichthyosaurs) other than the true - dinosaurs
3.
one that is impractically large, out-of-date, or obsolete
Merriam-Webster Online Thesaurus
dinosaur (noun)1.
one that has passed the peak of effectiveness or popularity
SYNONIMS:
dinosaur, relicRELATED WORDS:
dodo, fogy ( fogey), fossil, old-timer; fuddy-duddy, mossback, stick-in-the-mud, stodge [], troglodyte; throwbackNEAR ANTONYMS:
comer, rising star, up-and-comer2.
something or someone that is unusually large and powerful
SYNONIMS:
behemoth, blockbuster, colossus, dinosaur, dreadnought, elephant, Goliath, jumbo, leviathan, mammoth, mastodon, monster, titan, whale, whopperRELATED WORDS:
amazon, giantess; bulk, hulk; heavyweight; juggernaut, steamrollerNEAR ANTONYMS:
lightweight, weakling, wimp, wisp; nonentity, twerp, whippersnapper