- A dinosaur is defined as any of the large, extinct reptiles that roamed Earth during the Paleozoic and Mesozoic eras.
An example of a dinosaur is the Brontosaurus.
- The definition of a dinosaur is someone who resists change or is old-fashioned.
An example of a dinosaur is the person in the office who still sends messages by fax.
A statue of a dinosaur or dino.
dinosaur definition by Webster's New World
- any of various extinct, mostly land-dwelling, four-limbed saurischian or ornithischian reptiles of the Mesozoic Era, including some c. 30 m (98.4 ft) long: the flesh-eaters usually walked on their hind limbs, the plant-eaters on all fours
- loosely any large, extinct reptile of the Paleozoic or Mesozoic eras
- someone or something thought of as being old-fashioned, outmoded, resistant to change, etc.
Origin: dino- plush -saur
- dinosaurian adjective
dinosaur definition by American Heritage Dictionary
- Any of various extinct, often gigantic, carnivorous or herbivorous reptiles of the orders Saurischia and Ornithischia that were chiefly terrestrial and existed during the Mesozoic Era.
- A relic of the past: “living dinosaurs of the world of vegetation” (John Olmsted).
- One that is hopelessly outmoded or unwieldy: “The old, big-city teaching hospital is a dinosaur” (Peggy Breault).
Origin: New Latin Dīnosauria, group name, from Dīnosaurus, former genus name : Greek deinos, monstrous + Greek sauros, lizard.
- diˌno·sauˈric adjective
dinosaur - Science Definition