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| about |
more or less; approximately. [1/12 definitions] |
| agemate |
one of approximately the same age as another; contemporary; peer. |
| 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] |
| approx. |
abbreviation of "approximate" or "approximately." |
| Archean |
of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic. [1/2 definitions] |
| around |
at approximately. [1/13 definitions] |
| as2 |
an ancient Roman unit of weight equal to approximately twelve ounces; libra. [1/2 definitions] |
| ball lightning |
a rare form of lightning manifested in the form of a glowing reddish ball, approximately six inches to a foot in diameter, that moves rapidly along the ground or in the air until it disintegrates. |
| ballpark |
(informal) approximately correct; with some margin for error. [1/2 definitions] |
| Ben Nevis |
the name of the ship that landed in Galveston, Texas in 1854 with a congregation of approximately 500 Slavic immigrants who sought freedom from cultural oppression and religious persecution. [1/2 definitions] |
| bubble |
an approximately spherical volume of gas bounded by a liquid or a solid. [1/7 definitions] |
| c.2 |
abbreviation of "circa," about; approximately. |
| 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] |
| Cheng Tang |
first leader of the Shang dynasty of China, ruling in approximately the seventeenth century B.C.E. (exact dates contested). |
| circa |
about; approximately. |
| Circadian rhythm |
the approximately 24-hour cycle apparent in plants and animals that regulates hormone production, cell regeneration, sleeping and feeding patterns, and the like. [1/2 definitions] |
| Clovis point |
the oldest known type of flint tool in North America, esp. spearheads, dating to approximately 13,500 years ago and found near Clovis, New Mexico. |
| 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] |
| crude |
done roughly, approximately, or without polish. [1/7 definitions] |
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