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| Algonkian |
of, relating to, or designating the later of two geological periods of the Precambrian Era, from approximately 2.5 billion to 600 million years ago, when the first evidence of life appeared; Late Precambrian; Proterozoic. [1/4 definitions] |
| astronomical unit |
a unit of length based on the average distance of the earth from the sun, equal to about 149.6 million kilometers or ninety-three million miles. |
| bar2 |
a unit of pressure equal to one million dynes per square centimeter. |
| betatron |
in physics, an electron accelerator in which the speed of the electrons is increased to high energies, from a few million to a few hundred million electron volts, by the action of a rapidly changing magnetic field. |
| billion |
the product of multiplying one thousand by one million. [1/5 definitions] |
| Cambrian |
of, relating to, or designating the geological period at the start of the Paleozoic Era, from approximately 600 million to 500 million years ago, when marine animals such as trilobites were in abundance. [1/2 definitions] |
| carboniferous |
(cap.) of, relating to, or designating the geological time period between the Devonian and Permian of the Paleozoic Era, from approximately 350 million to 280 million years ago, when the warm damp climate produced many forests that later formed rich coal deposits. [1/3 definitions] |
| Cenozoic |
of, relating to, or designating the most recent geological era that includes the present and began approximately 70 million years ago, when many mammals appeared, the modern continents took shape, and glacial ice formed. [1/2 definitions] |
| cretaceous |
(cap.) of, relating to, or designating the geological period at the end of the Mesozoic Era, from approximately 135 million to 65 million years ago, when dinosaurs died out, early mammals and flowering plants appeared, and chalk beds were formed. [1/2 definitions] |
| Devonian |
of, relating to, or designating the geological period between the Silurian and the Carboniferous of the Paleozoic Era, from approximately 400 million to 350 million years ago, when large trees and amphibians appeared and fish were in great abundance. [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] |
| Eocene |
of, relating to, or designating the geological epoch between the Paleocene and Oligocene of the Tertiary Period, from approximately 54 million to 38 million years ago, when modern mammals became dominant. [1/2 definitions] |
| gold |
of a phonographic record or the like, having sold more than a specified number of copies, usu. one million. [1/11 definitions] |
| hyperbole |
in rhetoric, an obvious and deliberate exaggeration or overstatement, intended for effect and not to be taken literally, such as "He had a million excuses". (Cf. litotes.) |
| joule |
a unit of energy equal to the work done by one newton moving through a distance of one meter, or to ten million ergs. |
| Jurassic |
of, relating to, or designating the geological period between the Triassic and Cretaceous of the Mesozoic Era, from approximately 180 million to 135 million years ago, when primitive birds appeared and conifers were prominent. [1/2 definitions] |
| mastodon |
any of a number of extinct mammals of about two million years ago that were large and resembled the elephant. |
| mb |
abbreviation of "megabyte," or "megabytes," a unit of electronic memory capacity equal to 1,048,576 bytes, or approximately one million bytes. |
| mc |
abbreviation of "megacycle," or "megacycles," a unit of frequency equal to one million cycles per second or one million hertz; megahertz. |
| mega- |
one million. [1/2 definitions] |
| megabuck |
(informal) one million dollars. [1/2 definitions] |
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