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ammonite1 any of various coiled, flat, chambered fossil shells of extinct cephalopod mollusks from the Mesozoic era.
ape-man an extinct primate representing the transitional point in evolution between apes and modern man. (Cf. missing link.)
aurochs an extinct wild ox once common in northern Africa, Europe, and western Asia, and probably an ancestor of domestic cattle. [2 definitions]
Australopithecine a tool-making primate of an extinct genus of hominids that inhabited eastern and southern Africa.
Aztec the extinct language of this people. [1/4 definitions]
coelacanth a large bony fish that was thought to be extinct until a living specimen was found in 1938.
Coptic the Afro-Asiatic language of ancient Egypt now extinct except for ritual use in the Coptic Church. [1/3 definitions]
defunct no longer in existence or use; dead; extinct.
die out to become extinct. [1/2 definitions]
dinosaur one of various extinct reptiles that lived approximately 100 million years ago and included the largest land creatures. [1/2 definitions]
dodo any of several large, clumsy, flightless birds formerly found on islands in the Indian Ocean but now extinct. [1/2 definitions]
endangered species a species of plant or animal that is in danger of becoming extinct.
Etruscan the now extinct language of this country. [1/3 definitions]
extant still in existence; current; not extinct, destroyed, or lost.
extinction the act or process of becoming or making extinct, or of being ended or putting an end to. [1/2 definitions]
ganoid belonging to a group of fishes, some extinct, that have hard armorlike scales. [1/2 definitions]
great auk a large flightless North Atlantic auk that became extinct in the mid-nineteenth century.
Homo erectus (Latin) an extinct species of the human race that had a fairly small brain and an upright stance. (See Pithecanthropus.)
ichthyosaur any of an extinct variety of marine reptiles that had four flippers, a dolphinlike head, and a vertical caudal fin, and that ranged in length from four to forty feet.
longhorn one of a breed of beef cattle with long horns that was once common in the southwestern United States and is now nearly extinct.
mammoth a very large extinct mammal related to and resembling the elephant, that lived in the Northern Hemisphere. [1/2 definitions]