Definition of DINOSAUR

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>
Synonyms dinosaur, relic
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>
Antonyms diminutive, dwarf, half-pint, midget, mite, peewee, pygmy (also pigmy), runt, shrimp

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