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Amblypoda :: Amblypoda (n. pl.) A group of large, extinct, herbivorous mammals, common in the Tertiary formation of the United States..

Diatryma :: Diatryma (n.) An extinct eocene bird from New Mexico, larger than the ostrich..

Inoceramus :: Inoceramus (n.) An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period..

Dicynodont :: Dicynodont (n.) One of a group of extinct reptiles having the jaws armed with a horny beak, as in turtles, and in the genus Dicynodon, supporting also a pair of powerful tusks. Their remains are found in triassic strata of South Africa and India..

Fine :: Fine (n.) End; conclusion; termination; extinction.

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..

Megatheroid :: Megatheroid (n.) One of a family of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc..

Smilodon :: Smilodon (n.) An extinct genus of saber-toothed tigers. See Mach/rodus.

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

Extinction :: Extinction (n.) State of being extinguished or of ceasing to be; destruction; suppression; as, the extinction of life, of a family, of a quarrel, of claim..

Attainder :: Attainder (n.) The act of attainting, or the state of being attainted; the extinction of the civil rights and capacities of a person, consequent upon sentence of death or outlawry; as, an act of attainder..

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

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

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..

Auk :: Auk (n.) A name given to various species of arctic sea birds of the family Alcidae. The great auk, now extinct, is Alca (/ Plautus) impennis. The razor-billed auk is A. torda. See Puffin, Guillemot, and Murre..

Ichthyosauria :: Ichthyosauria (n. pl.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period..

Ammonite :: Ammonite (n.) A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis..

Enaliosauria :: Enaliosauria (n. pl.) An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders..

Crinoidea :: Crinoidea (n. pl.) A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, like some that are recent, were attached by a jointed stem. See Blastoidea, Cystoidea, Comatula..

Wear :: Wear (v. i.) To be wasted, consumed, or diminished, by being used; to suffer injury, loss, or extinction by use or time; to decay, or be spent, gradually..

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