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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..

Placodermi :: Placodermi (n. pl.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus..

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..

Cinder :: Cinder (n.) Partly burned or vitrified coal, or other combustible, in which fire is extinct..

Odontotormae :: Odontotormae (n.pl.) An order of extinct toothed birds having the teeth in sockets, as in the genus Ichthyornis. See Ichthyornis..

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

Atrypa :: Atrypa (n.) A extinct genus of Branchiopoda, very common in Silurian limestones..

Compensation :: Compensation (n.) The extinction of debts of which two persons are reciprocally debtors by the credits of which they are reciprocally creditors; the payment of a debt by a credit of equal amount; a set-off.

Ornithoscelida :: Ornithoscelida (n. pl.) A group of extinct Reptilia, intermediate in structure (especially with regard to the pelvis) between reptiles and birds..

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

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

Skunkhead :: Skunkhead (n.) A duck (Camptolaimus Labradorus) which formerly inhabited the Atlantic coast of New England. It is now supposed to be extinct. Called also Labrador duck, and pied duck..

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..

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..

Coccosteus :: Coccosteus (n.) An extinct genus of Devonian ganoid fishes, having the broad plates about the head studded with berrylike tubercles..

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

Anoplotherium :: Anoplotherium (n.) A genus of extinct quadrupeds of the order Ungulata, whose were first found in the gypsum quarries near Paris; characterized by the shortness and feebleness of their canine teeth (whence the name)..

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..

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

Odontopteryx :: Odontopteryx (n.) An extinct Eocene bird having the jaws strongly serrated, or dentated, but destitute of true teeth. It was found near London..

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