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

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

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

Saururae :: Saururae (n. pl.) An extinct order of birds having a long vertebrated tail with quills along each side of it. Archaeopteryx is the type. See Archaeopteryx, and Odontornithes..

Hipparion :: Hipparion (n.) An extinct genus of Tertiary mammals allied to the horse, but three-toed, having on each foot a small lateral hoof on each side of the main central one. It is believed to be one of the ancestral genera of the Horse family..

Trilobita :: Trilobita (n. pl.) An extinct order of arthropods comprising the trilobites.

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

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

Titanotherium :: Titanotherium (n.) A large American Miocene mammal, allied to the rhinoceros, and more nearly to the extinct Brontotherium..

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..

Escheat :: Escheat (n.) The falling back or reversion of lands, by some casualty or accident, to the lord of the fee, in consequence of the extinction of the blood of the tenant, which may happen by his dying without heirs, and formerly might happen by corruption of blood, that is, by reason of a felony or attainder..

Pentamerus :: Pentamerus (n.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian..

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

Sea Elephant :: Sea elephant () A very large seal (Macrorhinus proboscideus) of the Antarctic seas, much hunted for its oil. It sometimes attains a length of thirty feet, and is remarkable for the prolongation of the nose of the adult male into an erectile elastic proboscis, about a foot in length. Another species of smaller size (M. angustirostris) occurs on the coast of Lower California, but is now nearly extinct..

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..

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..

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.

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

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

Mosasaurian :: Mosasaurian (n.) One of an extinct order of reptiles, including Mosasaurus and allied genera. See Mosasauria..

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