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Perpetuation :: Perpetuation (n.) The act of making perpetual, or of preserving from extinction through an endless existence, or for an indefinite period of time; continuance..

Eurypterus :: Eurypterus (n.) A genus of extinct Merostomata, found in Silurian rocks. Some of the species are more than three feet long..

Taxeopoda :: Taxeopoda (n. pl.) An order of extinct Mammalia found in the Tertiary formations.

Theriodontia :: Theriodontia (n. pl.) An extinct order of reptiles found in the Permian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.

Cestraciont :: Cestraciont (n.) A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for crushing shellfish. Most of the species are extinct. The Port Jackson shark and a similar one found in California are living examples..

Decline :: Decline (v. i.) A falling off; a tendency to a worse state; diminution or decay; deterioration; also, the period when a thing is tending toward extinction or a less perfect state; as, the decline of life; the decline of strength; the decline of virtue and religion..

Amortization :: Amortization (n.) The extinction of a debt, usually by means of a sinking fund; also, the money thus paid..

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

Sivatherium :: Sivatherium (n.) A genus of very large extinct ruminants found in the Tertiary formation of India. The snout was prolonged in the form of a proboscis. The male had four horns, the posterior pair being large and branched. It was allied to the antelopes, but very much larger than any exsisting species..

Stegosauria :: Stegocephala (n. pl.) An extinct order of amphibians found fossil in the Mesozoic rocks; called also Stegocephali, and Labyrinthodonta..

Pterosauria :: Pterosauria (n. pl.) An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; -- called also Pterodactyli, and Ornithosauria..

Moa :: Moa (n.) Any one of several very large extinct species of wingless birds belonging to Dinornis, and other related genera, of the suborder Dinornithes, found in New Zealand. They are allied to the apteryx and the ostrich. They were probably exterminated by the natives before New Zealand was discovered by Europeans. Some species were much larger than the ostrich..

Deathless :: Deathless (a.) Not subject to death, destruction, or extinction; immortal; undying; imperishable; as, deathless beings; deathless fame..

Coryphodon :: Coryphodon (n.) A genus of extinct mammals from the eocene tertiary of Europe and America. Its species varied in size between the tapir and rhinoceros, and were allied to those animals, but had short, plantigrade, five-toed feet, like the elephant..

Die :: Die (v. i.) To perish in any manner; to cease; to become lost or extinct; to be extinguished.

Skunkhead :: Skunkhead (n.) A duck (Camptolaimus Labradorus) which formerly inhabited the Atlantic coast of New England. It is now supposed to be extinct. Called also Labrador duck, and pied duck..

Paleolithic :: Paleolithic (a.) Of or pertaining to an era marked by early stone implements. The Paleolithic era (as proposed by Lubbock) includes the earlier half of the Stone Age; the remains belonging to it are for the most part of extinct animals, with relics of human beings..

Hybodus :: Hybodus (n.) An extinct genus of sharks having conical, compressed teeth..

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

Modocs :: Modocs (n. pl.) A tribe of warlike Indians formerly inhabiting Northern California. They are nearly extinct.

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