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emerald

(Encyclopedia)emerald, the green variety of beryl, of which aquamarine is the blue variety. Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds. The emerald ...

snuff

(Encyclopedia)snuff, preparation of pulverized tobacco used by sniffing it into the nostrils, chewing it, or placing it between the gums and the cheek. The blended tobacco from which it is made is often aged for tw...

plateau

(Encyclopedia)plateau, elevated, level or nearly level portion of the earth's surface, larger in summit area than a mountain and bounded on at least one side by steep slopes, occurring on land or in oceans. Some pl...

Whymper, Edward

(Encyclopedia)Whymper, Edward hwĭmˈpər [key], 1840–1911, English illustrator and mountain climber, b. London. Sent to Switzerland to make sketches of mountain scenery, he became interested in mountaineering an...

Zea, Francisco Antonio

(Encyclopedia)Zea, Francisco Antonio fränsēsˈkō äntōˈnyō sāˈä [key], 1770–1882, Colombian botanist and revolutionist. He was associated with Mutis in botanical studies. Zea, like Antonio Nariño, was a...

Aguirre, Lope de

(Encyclopedia)Aguirre, Lope de lōˈpā ᵺā agēˈrā [key], c.1510–1561, Spanish rebel and adventurer in colonial South America. He was often involved in violence and sedition before joining (1560) the expedit...

Blasco Ibáñez, Vicente

(Encyclopedia)Blasco Ibáñez, Vicente vēthānˈtā bläˈskō ēbäˈnyāth [key] 1867–1928, Spanish novelist and politician, b. Valencia. Outspoken against the monarchy, Blasco Ibáñez published a radical rep...

Devonian period

(Encyclopedia)Devonian period dĭvōˈnēən [key], fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, tablegeologic timescale, table). It was named (...

Antarctic Peninsula

(Encyclopedia)Antarctic Peninsula, glaciated mountain region of W Antarctica, extending c.1,200 mi (1,930 km) N toward South America. In the south, volcanic peaks rise to c.11,000 ft (3,350 m); other volcanic cones...

Gates, Horatio

(Encyclopedia)Gates, Horatio, c.1727–1806, American Revolutionary general, b. Maldon, Essex, England. Entering the British army at an early age, he fought in America in the French and Indian War and served in the...