/ˈdaɪnəsɔːr/·noun·1841 CE (pre-publication use by Richard Owen); formally published 1842 in 'Report on British Fossil Reptiles, Part II'·Established
Origin
Coined in 1842 by anatomist Richard Owen from Greek deinos (terrible) and sauros (lizard), dinosaur moved from technical Latin order-name to cultural symbol of extinction — though under modern phylogenetics, birds are living dinosaurs, making the word's popular meaning of 'extinct thing' a scientific irony.
Definition
Any member of an extinct clade of terrestrial reptiles of the Mesozoic Era, characterized by an erect limb posture, formally named Dinosauria by Richard Owen in 1842 from Greek deinos (terrible) and sauros (lizard).
The Full Story
Modern English (coined from Classical Greek elements)1842 CEwell-attested
The word 'dinosaur' was coined in 1842 by the British comparative anatomist Richard Owen (1804–1892) in his paper 'Report on British Fossil Reptiles, Part II', presented to the British Association for the Advancement of Science. Owen combined twoAncientGreek components: 'deinos' (δεινός) meaning 'terrible, fearful, wondrous, mighty' and 'sauros' (σαῦρος) meaning 'lizard'. Owen used the term to name a new taxonomic order, Dinosauria, recognising that certain large fossil reptiles — including Megalosaurus, Iguanodon, and Hylaeosaurus — shared
Did you know?
When Richard Owen coined 'Dinosauria' in 1842, he was partly motivated by scientific rivalry: he wanted to establish the group's distinctiveness against rival anatomists who saw the fossils as merely large versions of living reptiles. More strikingly, Owen's original reconstruction got the posture completely wrong — he imagined dinosaurs as sprawling, elephant-like quadrupeds, not upright bipeds. The iconic image that made 'dinosaur' a household word, the Crystal Palace sculptures
connect it to *dwei- (to be fearful). The word 'sauros' (lizard) appears in earlier scientific nomenclature, as in 'ichthyosaurus' (1814) and 'plesiosaur' (1821). The Linnaean binomial tradition of using Greek and Latin in taxonomy made Owen's compound immediately intelligible to the scientific community. By the 1850s, 'dinosaur' had entered popular English usage, boosted by the famous Crystal Palace dinosaur sculptures (1854) overseen by Owen himself. The modern plural 'dinosaurs' and adjectival 'dinosaurian' followed rapidly. The root 'deinos' also appears in 'Deinonychus', 'Deinotherium', and 'deinosaur' (variant spelling). Scholarly sources: Owen (1842), ODEE, OED first citation 1841 (pre-publication use), Torrens (1992) on Owen's nomenclature. Key roots: *dʷey- (Proto-Indo-European: "to fear, to be in awe; related to dread and wonder"), δεινός (deinos) (Ancient Greek: "terrible, fearful, mighty, wondrous — used in Homer (Iliad, Odyssey) for both monsters and great warriors"), σαῦρος (sauros) (Ancient Greek: "lizard — used in Aristotle's Historia Animalium; foundational to Linnaean zoological nomenclature").