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Rugosa :: Rugosa (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid..

Mastodon :: Mastodon (n.) An extinct genus of mammals closely allied to the elephant, but having less complex molar teeth, and often a pair of lower, as well as upper, tusks, which are incisor teeth. The species were mostly larger than elephants, and their romains occur in nearly all parts of the world in deposits ranging from Miocene to late Quaternary time..

Rhabdophora :: Rhabdophora (n. pl.) An extinct division of Hydrozoa which includes the graptolities.

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

Brand :: Brand (v. t.) A burning piece of wood; or a stick or piece of wood partly burnt, whether burning or after the fire is extinct..

Ichthyosaurus :: Ichthyosaurus (n.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations..

Toxodon :: Toxodon (n.) A gigantic extinct herbivorous mammal from South America, having teeth bent like a bow. It is the type of the order Toxodonta..

Deathless :: Deathless (a.) Not subject to death, destruction, or extinction; immortal; undying; imperishable; as, deathless beings; deathless fame..

Dissolution :: Dissolution (n.) The extinction of life in the human body; separation of the soul from the body; death.

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..

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..

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

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

Labyrinthodonta :: Labyrinthodonta (n. pl.) An extinct order of Amphibia, including the typical genus Labyrinthodon, and many other allied forms, from the Carboniferous, Permian, and Triassic formations. By recent writers they are divided into two or more orders. See Stegocephala..

Dromatherium :: Dromatherium (n.) A small extinct triassic mammal from North Carolina, the earliest yet found in America..

Mastodonsaurus :: Mastodonsaurus (n.) A large extinct genus of labyrinthodonts, found in the European Triassic rocks..

Extinct :: Extinct (a.) Extinguished; put out; quenched; as, a fire, a light, or a lamp, is extinct; an extinct volcano..

Machairodus :: Machairodus (n.) A genus of extinct mammals allied to the cats, and having in the upper jaw canine teeth of remarkable size and strength; -- hence called saber-toothed tigers..

Orthopoda :: Orthopoda (n. pl.) An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts..

Orthis :: Orthis (n.) An extinct genus of Brachiopoda, abundant in the Paleozoic rocks..

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