Simple Definition of dinosaur
: one of many reptiles that lived on Earth millions of years ago
: someone or something that is no longer useful or current : an obsolete or out-of-date person or thing
Full Definition of dinosaur
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3 : one that is impractically large, out-of-date, or obsolete
dinosaurianplay \ˌdī-nə-ˈsȯr-ē-ən\ adjective
dinosauricplay \-ˈsȯr-ik\ adjective
Examples of dinosaur in a sentence
The old factory is now a rusting dinosaur.
The character she plays is a dinosaur—a former beauty queen who is living in the past.
Origin and Etymology of dinosaur
New Latin Dinosaurus, genus name, from Greek deinos terrifying + sauros lizard — more at dire
First Known Use: 1841
DINOSAUR Defined for Kids
Definition of dinosaur for Students
: any of a group of extinct often very large mostly land-dwelling reptiles that lived millions of years ago
Seen and Heard
What made you want to look up dinosaur? Please tell us where you read or heard it (including the quote, if possible).