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billion the number that is equal to one thousand times one million; 1,000,000,000. [1/4 definitions]
brontosaur a huge dinosaur that only ate plants. Brontosaurs had heavy bodies and very long necks and tails. They lived over 100 million years ago. Brontosaurs are now called apatosaurs by scientists who study dinosaurs.
dinosaur one of a group of extinct animals. Some kinds of dinosaurs were the largest animals that ever lived on land. Other dinosaurs were as small as chickens. The first kinds of dinosaurs developed over two hundred million years ago. The last kinds became extinct about sixty-five million years ago.
gold having sold more than a specific number of copies, usually one million. [1/7 definitions]
million being one million in number. [1/5 definitions]
millionaire a person whose money and property amount to at least a million dollars.
Paleozoic of, relating to, or belonging to the era in the earth's history from about 540 million years ago to about 250 million years ago. During this time, the first fishes, amphibians, reptiles, insects, and land plants appeared.
pterodactyl a flying reptile that lived at the same time as dinosaurs. Pterodactyls had wings covered with skin. Some were huge and glided over the oceans and caught fish. They became extinct over sixty-five million years ago.
Stone Age the stage of human culture when stone tools and weapons were made and used. The Stone Age dates from about two million B.C. to about 3,500 B.C.