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nitroglycerin

(Encyclopedia)nitroglycerin nīˌtrōglĭsˈərĭn [key], C3H5N3O9, colorless, oily, highly explosive liquid. It is the nitric acid triester of glycerol and is more correctly called glycerol trinitrate. It is insol...

avocet

(Encyclopedia)avocet ăvˈəsĕt [key], common name for a long-legged wading bird about 15 to 18 in. (37.5–45 cm) long, related to the snipe and belonging to the same family as the stilt. The American avocet or b...

Woolley, Sir Charles Leonard

(Encyclopedia)Woolley, Sir Charles Leonard, 1880–1960, English archaeologist. His early work included excavations at Carchemish (1912–14) and the Egyptian site of Tell el Amarna (1921–22). He was then chosen ...

Stratford de Redcliffe, Stratford Canning, Viscount

(Encyclopedia)Stratford de Redcliffe, Stratford Canning, Viscount, 1786–1880, British diplomat. He entered (1807) the foreign office under the aegis of his cousin, George Canning. Sent (1808) to Turkey, he negoti...

Abbadids

(Encyclopedia)Abbadids ăˈbədĭdz [key], Arab dynasty in Spain that ruled Seville from 1023 to 1091. Taking advantage of the disintegration of the caliphate of Córdoba, the cadi [judge-governor] of Seville seize...

tensor

(Encyclopedia)tensor, in mathematics, quantity that depends linearly on several vector variables and that varies covariantly with respect to some variables and contravariantly with respect to others when the coordi...

Ter Borch, Gerard

(Encyclopedia)Ter Borch or Terborch, Gerard gāˈrärt tərbôrkhˈ [key], 1617–81, Dutch genre and portrait painter. He studied with his father and traveled throughout Europe, showing extraordinary precocity in ...

Carlos the Jackal

(Encyclopedia)Carlos the Jackal, pseud. of the revolutionary and international terrorist Ilich Ramírez Sánchez, 1949–, b. Caracas, Venezuela. Son of an affluent Marxist lawyer, he joined the Communist party at ...

Uruk

(Encyclopedia)Uruk ēˈrĕk [key], ancient Sumerian city of Mesopotamia, on the Euphrates and NW of Ur (in present-day S Iraq). It is the modern Tall al Warka. Uruk, dating from the 5th millennium b.c., was the lar...

weather satellite

(Encyclopedia)weather satellite, artificial satellite used to gather data on a global basis for improvement of weather forecasting. Information includes cloud cover, storm location, temperature, and heat balance in...