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dinosaur

noun

di·​no·​saur ˈdī-nə-ˌsȯr How to pronounce dinosaur (audio)
1
: any of a group (Dinosauria) of extinct, often very large, carnivorous or herbivorous archosaurian reptiles that have the hind limbs extending directly beneath the body and include chiefly terrestrial, bipedal or quadrupedal ornithischians (such as ankylosaurs and stegosaurs) and saurischians (such as sauropods and theropods) which flourished during the Mesozoic era from the late Triassic period to the end of the Cretaceous period
The dinosaurs, which once dominated the earth, disappeared very swiftly, leaving room for tiny shrewlike creatures to crawl out of shelter and start on the road to mammalian domination of the planet. D. E. Thomsen
Most scientists now concur that at least one great extraterrestrial object struck the planet around the time the dinosaurs died out. Rick Gore
also : any of a broader group that also includes all living and extinct birds
The overwhelming majority of scientists are now convinced that birds are theropod dinosaurs James O'Donoghue

Note: Dinosaurs have traditionally been considered a separate group from birds, which evolved from dinosaurs, but modern paleontologists now view birds as survivors of a theropod lineage of dinosaurs. In this classification, all dinosaurs except birds became extinct at the end of the Cretaceous period approximately 65 million years ago, with all dinosaurs that are not birds referred to as dinosaurs or non-avian dinosaurs and birds typically referred to as avian dinosaurs.

2
: any of various large extinct reptiles (such as an ichthyosaur or mosasaur) other than the true dinosaurs
3
: one that is impractically large, out-of-date, or obsolete
The factory is now a rusting dinosaur.
dinosaurian adjective
dinosauric adjective

Synonyms

Example Sentences

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.
Recent Examples on the Web The color purple has always been iconic, from Barney the dinosaur to Lady Gaga’s House of Gucci U.K. premiere gown. Carrie Wittmer, Glamour, 8 Aug. 2022 The most prominent lightning rod for the ongoing argument about fossil smuggling and colonialist science is a dinosaur from Brazil. Riley Black, Smithsonian Magazine, 10 Feb. 2022 StarCraft II is a dinosaur compared to the titles that burn up the Twitch charts every day. Luke Winkie, Wired, 11 Dec. 2021 Nash and Joe are back in a movie-length adventure, with a lot of younger colleagues who tease the former about being a dinosaur and the occasional old-man gripe about things like using directional apps during a car chase. Brian Lowry, CNN, 26 Nov. 2021 Never get married to your distribution sort of platform for fear of being a dinosaur someday. Steve Baltin, Forbes, 9 Nov. 2021 Some say the big man is a dinosaur who should be relegated from the junk drawer into the junk heap. Gordon Monson, The Salt Lake Tribune, 21 June 2021 Firefox predates Chrome — but this browser is no dinosaur. Kim Komando, USA TODAY, 11 June 2021 For example, its neighbors included crocodilia, turtles, fish and a giant, aquatic dinosaur called the spinosaurus. Saleen Martin, USA TODAY, 2 Aug. 2022 See More

Word History

Etymology

borrowed from presumed New Latin *dinosaurus, the base of Dinosauria, former reptile taxon, from Greek deinós "inspiring dread or awe" + -o- -o- + New Latin Sauria, former reptile suborder, from Greek saúros "lizard" + New Latin -ia -ia entry 2 — more at deinonychus, -saurus

Note: The taxonomic name Dinosauria as well as the vernacular form dinosaur were both introduced by the British biologist and paleontologist Richard Owen (1804-92) in "Report on British Fossil Reptiles. Part II," Report of the Eleventh Meeting of the British Association for the Advancement of Science ("Held at Plymouth in July 1841") (London: J. Murray, 1842), p. 103: "The combination of such characters, some, as the sacral ones [i.e., the sacral vertebrae fused into a single structure], altogether peculiar among Reptiles, others borrowed, as it were, from groups now distinct from each other, and all manifested by creatures far surpassing in size the largest of existing reptiles, will, it is presumed, be deemed sufficient ground for establishing a distinct tribe or sub-order of Saurian Reptiles, for which I would propose the name of Dinosauria. [Footnote to the above] Gr. deinòs, fearfully great; saúros, a lizard." Although Owen's "Report on British Fossil Reptiles" purports to be the record of an oral presentation given at Plymouth in July, 1841, the detailed contemporary accounts of Owen's lecture do not mention dinosaur or Dinosauria, and it is now clear that he only introduced the word with the extensively revised version of the report released in April, 1842. The background to Owen's report is analyzed by Hugh S. Torrens in "Politics and Paleontology: Richard Owen and the Invention of Dinosaurs," M. K. Brett-Surman, et al., editors, The Complete Dinosaur, 2nd edition (Indiana University Press, 2012), pp. 25-43. Offprints of Owen's article have the publication date 1841, but, as Torrens demonstrates (p. 34), this was an error (perhaps deliberately uncorrected by Owen). Owen's rendering of Greek deinós (a word with a wide semantic range) as "fearfully great" is at odds with the conventional notion that dinosaur means "terrible lizard" in Greek. Although "terrible" (i.e., terrifying) is a possible translation of deinós, it does not appear to be the meaning Owen intended.

First Known Use

1842, in the meaning defined at sense 1

Time Traveler
The first known use of dinosaur was in 1842

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