Etymology
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Words related to -saurus

ankylosaurus (n.)
Cretaceous armored dinosaur, 1907, Modern Latin, from Greek ankylos "bent, curved" (see angle (n.)) + -saurus. Said to be a reference to the curved ribs.
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brachiosaurus (n.)
1903, Modern Latin, from Greek brakhion "an arm" (see brachio-) + -saurus. The forelegs are notably longer than the hind legs.
brontosaurus (n.)
one of the first well-known dinosaurs, popularly noted for its great size and small brain capacity, 1879, coined by U.S. paleontologist O.C. Marsh in Modern Latin, from Greek bronte "thunder" (perhaps from PIE imitative root *bhrem- "to growl") + -saurus. The confusion with apatosaurus dates to at least 1903 and scientists still debate whether they are the same species or not.
ceratosaurus (n.)

meat-eating dinosaur of the Jurassic period, 1884, from cerato- "horn" + -saurus. So called for the small horn on its nose.

dinosaur (n.)

one of the Dinosauria, a class of extinct Mesozoic reptiles often of enormous size, 1841, coined in Modern Latin by Sir Richard Owen, from Greek deinos "terrible" (see dire) + sauros "lizard" (see -saurus). Figurative sense of "person or institution not adapting to change" is from 1952. Related: Dinosaurian.

elasmosaurus (n.)

giant sea reptile from the Mesozoic, 1868, from Modern Latin (coined by E.D. Cope), from Greek elasmos "metal plate" (from elan "to strike;" see elastic) + -saurus. So called from the caudal laminae and the great plate-bones.

hadrosaur (n.)
1865, from Modern Latin hadrosaurus (1859), from Greek hadros "thick, stout" (see hadron) + -saurus.
ichthyosaur (n.)
extinct aquatic reptile, 1830, Modern Latin, from Latinized form of Greek ikhthys "fish" (see ichthyo-) + -saurus. Related: Ichthyosaurus (1819); ichthyosaurian.
mosasaurus (n.)

carnivorous marine reptile of the Cretaceous period, 1830, from Latin Mosa "the river Meuse" (Dutch Maas) + -saurus. the first fossils of the ancient reptile were discovered 1760s in a chalk quarry near Maastricht, on the Meuse.

plesiosaurus (n.)

extinct gigantic long-necked marine reptile, 1825, from Modern Latin Pleisiosaurus (1821), coined by English paleontologist William Daniel Conybeare (1787-1857) from Greek plēsios "near" (related to pelas "near, nearby," and probably from PIE *pelh- "to approach") + sauros "lizard" (see -saurus). It was one of the earliest "antediluvian" reptile fossils discovered in the scientific age and was so called for being more like a modern lizard than the ichthyosaur fossils that had been found a few years earlier in the same rock in England.