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Uintatherium :: Uintatherium (n.) An extinct genus of large Eocene ungulates allied to Dinoceras. This name is sometimes used for nearly all the known species of the group. See Dinoceras.

Solitaire :: Solitaire (n.) A large extinct bird (Pezophaps solitaria) which formerly inhabited the islands of Mauritius and Rodrigeuz. It was larger and taller than the wild turkey. Its wings were too small for flight. Called also solitary.

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..

Rhinoceros :: Rhinoceros (n.) Any pachyderm belonging to the genera Rhinoceros, Atelodus, and several allied genera of the family Rhinocerotidae, of which several living, and many extinct, species are known. They are large and powerful, and usually have either one or two stout conical median horns on the snout..

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

Megatherium :: Megatherium (n.) An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America..

Decline :: Decline (v. i.) To tend or draw towards a close, decay, or extinction; to tend to a less perfect state; to become diminished or impaired; to fail; to sink; to diminish; to lessen; as, the day declines; virtue declines; religion declines; business declines..

Nototherium :: Nototherium (n.) An extinct genus of gigantic herbivorous marsupials, found in the Pliocene formation of Australia..

Extinct :: Extinct (a.) Without a survivor; without force; dead; as, a family becomes extinct; an extinct feud or law..

Rudistes :: Rudistes (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

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

Eosaurus :: Eosaurus (n.) An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles.

Hesperornis :: Hesperornis (n.) A genus of large, extinct, wingless birds from the Cretaceous deposits of Kansas, belonging to the Odontornithes. They had teeth, and were essentially carnivorous swimming ostriches. Several species are known. See Illust. in Append..

Eurypteroidea :: Eurypteroidea (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks..

Extinguishment :: Extinguishment (n.) The act of extinguishing, putting out, or quenching, or the state of being extinguished; extinction; suppression; destruction; nullification; as, the extinguishment of fire or flame, of discord, enmity, or jealousy, or of love or affection..

Expiration :: Expiration (n.) A coming to a close; cessation; extinction; termination; end.

Absumption :: Absumption (n.) Act of wasting away; a consuming; extinction.

Vaisya :: Vaisya (n.) The third of the four great original castes among the Hindus, now either extinct or partially represented by the mercantile class of Banyas. See the Note under Caste, 1..

Clidastes :: Clidastes (n.) A genus of extinct marine reptiles, allied to the Mosasaurus. See Illust. in Appendix..

Lepidodendrid :: Lepidodendrid (n.) One of an extinct family of trees allied to the modern club mosses, and including Lepidodendron and its allies..

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