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Ornithopappi :: Ornithopappi (n. pl.) An extinct order of birds. It includes only the Archaeopteryx.

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

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..

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

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..

Orthoceras :: Orthoceras (n.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa..

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

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

Moho :: Moho (n.) A gallinule (Notornis Mantelli) formerly inhabiting New Zealand, but now supposed to be extinct. It was incapable of flight. See Notornis..

Perpetuate :: Perpetuate (v. t.) To make perpetual; to cause to endure, or to be continued, indefinitely; to preserve from extinction or oblivion; to eternize..

Productus :: Productus (n.) An extinct genus of brachiopods, very characteristic of the Carboniferous rocks..

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

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..

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

Expire :: Expire (v. i.) To come to an end; to cease; to terminate; to perish; to become extinct; as, the flame expired; his lease expires to-day; the month expired on Saturday..

Merostomata :: Merostomata (n. pl.) A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus..

Zaphrentis :: Zaphrentis (n.) An extinct genus of cyathophylloid corals common in the Paleozoic formations. It is cup-shaped with numerous septa, and with a deep pit in one side of the cup..

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

Gyrodus :: Gyrodus (n.) A genus of extinct oolitic fishes, having rounded teeth in several rows adapted for crushing..

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..

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