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Otozoum :: Otozoum (n.) An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones..

Xiphodon :: Xiphodon (n.) An extinct genus of artiodactylous mammals found in the European Tertiary formations. It had slender legs, didactylous feet, and small canine teeth..

Hybodont :: Hybodont (a.) Of, pertaining to, or resembling, an extinct genus of sharks (Hybodus), especially in the form of the teeth, which consist of a principal median cone with smaller lateral ones..

Extinguishment :: Extinguishment (n.) The annihilation or extinction of a right or obligation.

Megaphyton :: Megaphyton (n.) An extinct genus of tree ferns with large, two-ranked leaves, or fronds..

Pentamerus :: Pentamerus (n.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian..

Epiornis :: Epiornis (n.) One of the gigantic ostrichlike birds of the genus Aepiornis, only recently extinct. Its remains have been found in Madagascar..

Dinotherium :: Dinotherium (n.) A large extinct proboscidean mammal from the miocene beds of Europe and Asia. It is remarkable fora pair of tusks directed downward from the decurved apex of the lower jaw.

Goniatite :: Goniatite (n.) One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian formation, the latest, in the Triassic..

Mylodon :: Mylodon (n.) An extinct genus of large slothlike American edentates, allied to Megatherium..

Decay :: Decay (n.) Gradual failure of health, strength, soundness, prosperity, or of any species of excellence or perfection; tendency toward dissolution or extinction; corruption; rottenness; decline; deterioration; as, the decay of the body; the decay of virtue; the decay of the Roman empire; a castle in decay..

Dinosauria :: Dinosauria (n. pl.) 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..

Rugosa :: Rugosa (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid..

Titanotherium :: Titanotherium (n.) A large American Miocene mammal, allied to the rhinoceros, and more nearly to the extinct Brontotherium..

Rukh :: Rukh (n.) A large bird, supposed by some to be the same as the extinct Epiornis of Madagascar..

Toxodonta :: Toxodonta (n.pl.) An extinct order of Mammalia found in the South American Tertiary formation. The incisor teeth were long and curved and provided with a persistent pulp. They are supposed to be related both to the rodents and ungulates. Called also Toxodontia.

Out :: Out (a.) Beyond the limit of existence, continuance, or supply; to the end; completely; hence, in, or into, a condition of extinction, exhaustion, completion; as, the fuel, or the fire, has burned out..

Dinichthys :: Dinichthys (n.) A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating animals twenty feet in length..

Dinornis :: Dinornis (n.) A genus of extinct, ostrichlike birds of gigantic size, which formerly inhabited New Zealand. See Moa..

Mastodon :: Mastodon (n.) An extinct genus of mammals closely allied to the elephant, but having less complex molar teeth, and often a pair of lower, as well as upper, tusks, which are incisor teeth. The species were mostly larger than elephants, and their romains occur in nearly all parts of the world in deposits ranging from Miocene to late Quaternary time..

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