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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..

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

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..

Pliosaurus :: Pliosaurus (n.) An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck..

Garrote :: Garrote (n.) A Spanish mode of execution by strangulation, with an iron collar affixed to a post and tightened by a screw until life become extinct; also, the instrument by means of which the punishment is inflicted..

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

Spiritoso :: Spiritless (a.) Having no breath; extinct; dead.

Death :: Death (v. i.) Total privation or loss; extinction; cessation; as, the death of memory..

Pliohippus :: Pliohippus (n.) An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse..

Slake :: Slake (v. i.) To go out; to become extinct.

Tasmanian :: Tasmanian (a.) Of or pertaining to Tasmania, or Van Diemen's Land. -- n. A native or inhabitant of Tasmania; specifically (Ethnol.), in the plural, the race of men that formerly inhabited Tasmania, but is now extinct..

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

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..

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..

Dodo :: Dodo (n.) A large, extinct bird (Didus ineptus), formerly inhabiting the Island of Mauritius. It had short, half-fledged wings, like those of the ostrich, and a short neck and legs; -- called also dronte. It was related to the pigeons..

Extinct :: Extinct (v. t.) To cause to be extinct.

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..

Werewolf :: Werewolf (n.) A person transformed into a wolf in form and appetite, either temporarily or permanently, whether by supernatural influences, by witchcraft, or voluntarily; a lycanthrope. Belief in werewolves, formerly general, is not now extinct..

Phocodontia :: Phocodontia (n. pl.) A group of extinct carnivorous whales. Their teeth had compressed and serrated crowns. It includes Squalodon and allied genera.

Sigillarid :: Sigillarid (n.) One of an extinct family of cryptagamous trees, including the genus Sigillaria and its allies..

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