Columbia Encyclopedia

Search results

224 results found

Suez Canal

(Encyclopedia)Suez Canal, Arab. Qanat as Suways, waterway of Egypt extending from Port Said to Port Tawfiq (near Suez) and connecting the Mediterranean Sea with the Gulf of Suez and thence with the Red Sea. The can...

gem, ornamental mineral or organic substance

(Encyclopedia)gem, commonly, a mineral or organic substance, cut and polished and used as an ornament. Gems also are used as seals (items of assurance) and as talismans (good-luck charms). For birthstones, see mont...

reaper

(Encyclopedia)reaper, early farm machine drawn by draft animals or tractor and used to harvest grain. Its historical predecessors were the sickle and the cradle scythe, which are still used in some parts of the wor...

pruning

(Encyclopedia)pruning, the horticultural practice of cutting away an unwanted, unnecessary, or undesirable plant part, used most often on trees, shrubs, hedges, and woody vines. Man uses pruning to remove diseased ...

hyperbola

(Encyclopedia)CE5 Hyperbola hyperbola hīpûrˈbələ [key], plane curve consisting of all points such that the difference between the distances from any point on the curve to two fixed points (foci) is the sam...

Xerxes I

(Encyclopedia)Xerxes I (Xerxes the Great) zûrkˈsēz [key], d. 465 b.c., king of ancient Persia (486–465 b.c.). His name in Old Persian is Khshayarsha, in the Bible Ahasuerus. He was the son of Darius I and Atos...

bark, in botany

(Encyclopedia)bark, outer covering of the stem of woody plants, composed of waterproof cork cells protecting a layer of food-conducting tissue—the phloem or inner bark (also called bast). As the woody stem increa...

Cripps, Sir Stafford

(Encyclopedia)Cripps, Sir Stafford, 1889–1952, British statesman. A brilliant and successful patent and corporation lawyer, he joined the Labour party in 1929 and became solicitor general in 1930, being knighted ...

chestnut

(Encyclopedia)chestnut, name for any species of the genus Castanea, deciduous trees of the family Fagaceae (beech or oak family) widely distributed in the Northern Hemisphere. They are characterized by thin-shelled...

decompression sickness

(Encyclopedia)decompression sickness, physiological disorder caused by a rapid decrease in atmospheric pressure, resulting in the release of nitrogen bubbles into the body tissues. It is also known as caisson disea...