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rejería

(Encyclopedia)rejería rāhārēˈä [key], the art of making iron screens and grilles, developed in Spain from the Romanesque period through the Renaissance. It employs chiseled and hammered metal as well as wroug...

wheel

(Encyclopedia)wheel. Through the many millennia of the Paleolithic period and the Neolithic period no use of the wheel was known to humans. Its use was not known to the Native Americans until the Europeans introduc...

Five-Year Plan

(Encyclopedia)Five-Year Plan, Soviet economic practice of planning to augment agricultural and industrial output by designated quotas for a limited period of usually five years. Nations other than the former USSR a...

day

(Encyclopedia)day, period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary o...

puts and calls

(Encyclopedia)puts and calls, in securities trading. A call is a contract that gives the holder the right to purchase a given stock at a specific price within a designated period of time. It is the opposite of a pu...

atlatl

(Encyclopedia)atlatl ätˈlätəl [key] [Nahuatl], device used to throw a spear with greater propulsion. Atlatls began to be used in the Americas in the post-Pleistocene period and were eventually replaced by the b...

isotherm

(Encyclopedia)isotherm, line drawn on a map of a particular region of the earth's surface connecting points of equal temperature; each point reflects one temperature reading or an average of several readings over a...

Georgian architecture

(Encyclopedia)Georgian architecture. It includes several trends in English architecture that were predominant during the reigns (1714–1830) of George I, George II, George III, and George IV. The first half of the...

Iron Age

(Encyclopedia)Iron Age, period in the development of industry that begins with the general use of iron and continues into modern times. In Asia, Egypt, and Europe it was preceded by the Bronze Age. It did not begin...

Ugarit

(Encyclopedia)Ugarit o͞ogərētˈ [key], ancient city, capital of the Ugarit kingdom, W Syria, on the Mediterranean coast N of modern Latakia. Although the name of this city was known from Egyptian and Hittite sou...