n. 1. 1 a genus of extinct dinosaurs comprising the brontosaurs; apatosaurs.
Syn. -- genus Apatosaurus. [ WordNet 1.5 ]

‖n. [ Hind. ] (Zool.) A badgerlike animal of India (Arctonyx collaris). [ 1913 Webster ]

n. [ NL., fr. Gr. bronth` thunder + say^ros lizard. ] (Paleon.) a dinosaur of the genus Brontosaurus; an individual may also be called a brontosaurus or an apatosaurus. [ PJC ]

‖n. [ NL., fr. Gr. bronth` thunder + say^ros lizard. ] (Paleon.) A genus of large sauropod American dinosaurs of the jurassic era, or an individual of that genus. A length of sixty feet is believed to have been attained by these reptiles. The genus is also called Apatosaurus, and individuals of the genus are also called brontosaurs. [ 1913 Webster +PJC ]

n. a genus of lizards including the the zebra-tailed lizard.
Syn. -- genus Callisaurus. [ WordNet 1.5 ]

‖n. [ NL. fr. Gr. &unr_; a vaulted chamber + &unr_; lizard. ] (Paleon.) A genus of gigantic American Jurassic dinosaurs, having large cavities in the bodies of the dorsal vertebræ. [ 1913 Webster ]

n. (Paleon.) the ceratosaurus.
Syn. -- ceratosaurus. [ WordNet 1.5 ]

‖n. [ NL., fr. Gr. ke`ras a horn + &unr_; lizard. ] (Paleon.) A swift-running bipedal carnivorous American Jurassic dinosaur allied to the European Megalosaurus. The animal was nearly twenty feet in length, and the skull bears a bony short horn between the nostrils on the united nasal bones. See Illustration in Appendix. [ 1913 Webster + WordNet 1.5 ]

n. a genus of frilled lizards.
Syn. -- genus Chlamydosaurus. [ WordNet 1.5 ]

n. [ Gr. chryso`s gold + L. aurum gold. So called from its color. ] An orange-colored dyestuff, of artificial production. [ 1913 Webster ]

‖n. [ NL. ] (Paleon.) See Dinosaur. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. &unr_; terrible + &unr_; lizard. ] (Paleon.) An order of extinct mesozoic reptiles, mostly of large size (whence the name). Notwithstanding their size, they present birdlike characters in the skeleton, esp. in the pelvis and hind limbs. Some walked on their three-toed hind feet, thus producing the large “bird tracks, ” so-called, of mesozoic sandstones; others were five-toed and quadrupedal. See Illust. of Compsognathus, also Illustration of Dinosaur in Appendix.

{ } n. [ Gr. &unr_; terrible + &unr_; lizard. ] (Paleon.) One of the Dinosauria. [ Written also deinosaur, and deinosaurian. ] [ 1913 Webster ]

n. an extinct heavy-bodied reptile of the late Paleozoic having a dorsal sail or crest. [ WordNet 1.5 ]

‖n. [ NL., fr. Gr. &unr_; a metal plate + &unr_; a lizard. ] (Paleon.) An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus. [ 1913 Webster ]

n. (Paleon.) One of the Enaliosauria. [ 1913 Webster ]

‖n. pl. [ NL., from Gr. &unr_; marine (&unr_; in + &unr_; the sea) + &unr_; a lizard. ] (Paleon.) An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders. [ 1913 Webster ]

a. (Paleon.) Pertaining to the Enaliosauria. -- n. One of the Enaliosauria. [ 1913 Webster ]

‖n. [ NL., fr. Gr. 'hw`s dawn + say^ros lizard. ] (Paleon.) An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles. [ 1913 Webster ]

n. Any member of the genus Hadrosaurus or family Hadrosauridae, an extinct family of heavy bipedal partly aquatic dinosaurs with duck-billed skull and webbed feet; of the Upper Cretaceous in North America.
Syn. -- hadrosaurus. [ WordNet 1.5 ]

prop. n. A natural family of extinct reptiles including the duck-billed dinosaurs.
Syn. -- family Hadrosauridae. [ WordNet 1.5 ]

‖n. [ NL., fr. Gr. "adro`s thick + say^ros lizard.] (Paleon.) An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation. [1913 Webster]

‖n. pl. [ NL., fr. Gr. "a`ls, "alo`s, sea + say^ros. ] (Paleon.) The Enaliosauria. [ 1913 Webster ]

{ ‖ } n. [ NL. hylaeosaurus, fr. Gr. &unr_; belonging to a forest (fr. &unr_; wood) + &unr_; a lizard. ] (Paleon.) A large Wealden dinosaur from the Tilgate Forest, England. It was about twenty feet long, protected by bony plates in the skin, and armed with spines. [ 1913 Webster ]

n. Same as Hylæosaur. [ 1913 Webster ]

n. [ Cf. F. ichthyosaure. ] (Paleon.) One of the Ichthyosaura. [ 1913 Webster ]

‖n. pl. [ NL. See Ichthyosaurus. ] (Paleon.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period. [ 1913 Webster ]

a. (Paleon.) Of or pertaining to the Ichthyosauria. -- n. One of the Ichthyosauria. [ 1913 Webster ]

‖n.; pl. Ichthyosauri [ NL., fr. Gr. 'ichqy`s, -y`os, a fish + say^ros a lizard. ] (Paleon.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebræ, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oölitic, and Cretaceous formations. [ 1913 Webster ]

n. An extinct reptile intermediate in form between the therapsids and most primitive true mammals. [ WordNet 1.5 ]

n. An order of extinct reptiles of the Upper Triassic.
Syn. -- order Ictodosauria. [ WordNet 1.5 ]

‖n. pl. [ NL., fr. Gr. lepi`s -i`dos, a scale + say^ros a lizard. ] (Zool.) A division of reptiles, including the serpents and lizards; the Plagiotremata. [ 1913 Webster ]

‖n. [ NL., fr. E. Mastodon + Gr. say^ros a lizard. ] (Paleon.) A large extinct genus of labyrinthodonts, found in the European Triassic rocks. [ 1913 Webster ]

{ ‖ } n. [ NL. megalosaurus, fr. Gr. me`gas, mega`lh, great + say^ros lizard: cf. F. mégalosaure. ] (Paleon.) A gigantic carnivorous dinosaur, whose fossil remains have been found in England and elsewhere. [ 1913 Webster ]

‖n. Same as Mosasauria. [ 1913 Webster ]

‖n. [ NL., from Gr. mw^ros stupid + sau^ros lizard. ] (Paleon.) An extinct genus of large herbivorous dinosaurs, found in Jurassic strata in America. [ 1913 Webster ]

‖n. pl. [ NL. See Mosasaurus. ] (Paleon.) An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having loosely articulated and dilatable jaws, with large recurved teeth, but they had paddlelike feet. Some of them were over fifty feet long. They are, essentially, fossil sea serpents with paddles. Called also Pythonomarpha, and Mosasauria. [ 1913 Webster ]

{ } n. (Paleon.) One of an extinct order of reptiles, including Mosasaurus and allied genera. See Mosasauria. [ 1913 Webster ]

‖n. [ NL., fr. L. Mosa the River Meuse (on which Meastricht is situated) + Gr. &unr_; a lizard. ] (Paleon.) A genus of extinct marine reptiles allied to the lizards, but having the body much elongated, and the limbs in the form of paddles. The first known species, nearly fifty feet in length, was discovered in Cretaceous beds near Maestricht, in the Netherlands. [ Written also Mososaurus. ] [ 1913 Webster ]

‖n. [ NL. ] (Paleon.) Same as Mosasaurus. [ 1913 Webster ]

n. An extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming. [ WordNet 1.5 ]

‖prop. n. pl. [ NL. See Ornitho-, and Sauria. ] (Paleon.) An order of extinct flying reptiles; -- called also Pterosauria. [ 1913 Webster ]

n. [ NL., fr. Gr. palaio`s ancient + say^ros a lizard. ] (Paleon.) A genus of fossil saurians found in the Permian formation. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. peli`ka a wooden bowl (but taken to mean, pelvis) + say^ros a lizard. ] (Paleon.) A suborder of Theromorpha, including terrestrial reptiles from the Permian formation. [ 1913 Webster ]

n. 1. A large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America. [ WordNet 1.5 ]

prop. n. 1. An order of extinct reptiles including edaphosaurus and dimetrodon.
Syn. -- order Pelycosauria. [ WordNet 1.5 ]

‖n. [ NL. ] (Paleon.) Same as Pliosaurus. [ 1913 Webster ]

n. (Paleon.) One of the Plesiosauria. [ 1913 Webster ]

‖n. pl. [ NL. See Plesiosaurus. ] (Paleon.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia. [ 1913 Webster ]

n. (Paleon.) A plesiosaur. [ 1913 Webster ]