Columbia Encyclopedia

Search results

500 results found

terrace

(Encyclopedia)terrace, a level field built on top of a hillslope into the floor of a deep valley to improve cultivation of crops. Terracing uses the runoff from the hill to increase soil retentiveness and arability...

Trans-Alai

(Encyclopedia)Trans-Alai trăns-älīˈ, trănz– [key], mountain range, central Asia, a part of the Pamir-Alai mountain system. The Trans-Alai extends 155 mi (249 km) W from China to form the border between Kyrgy...

vertical circle

(Encyclopedia)vertical circle, in astronomy, the great circle on the celestial sphere that passes from the observer's zenith through a given celestial body. In the altazimuth coordinate system the altitude of a bod...

Dausset, Jean

(Encyclopedia)Dausset, Jean zhäN dōsĕˈ [key], 1916–2009, French immunologist. A physician specializing in blood diseases, he was the laboratory director of the National Blood Transfusion Center (1946–63) an...

Guido d'Arezzo

(Encyclopedia)Guido d'Arezzo ârətīˈnəs [key], c.990–1050, Italian Benedictine monk, known for his contributions to musical notation and theory. His theoretical work Micrologus (c.1025) is one of the principa...

Jussieu

(Encyclopedia)Jussieu zhüsyöˈ [key], French family of distinguished botanists. Antoine de Jussieu, 1686–1758, was director of the Jardin des Plantes, Paris. He edited Jacques Barrelier's posthumously published...

managed health care

(Encyclopedia)managed health care, system of health-care delivery that aims to control costs by assigning set fees for services, monitoring the need for procedures such as tests and surgical operations, and stressi...

Lowell, Abbott Lawrence

(Encyclopedia)Lowell, Abbott Lawrence, 1856–1943, American educator, president of Harvard (1909–33), b. Boston, grad. Harvard (B.A., 1877; LL.B., 1880); brother of Percival Lowell and Amy Lowell. He practiced l...

Masora

(Encyclopedia)Masora or Massorah məsōˈrə [key] [Heb.,=tradition], collection of critical annotations made by Hebrew scholars, called the Masoretes, to establish the text of the Old Testament. A principal proble...

enkephalin

(Encyclopedia)enkephalin ĕnkĕfˈəlĭn [key], one of several naturally occurring morphinelike substances (endorphins) released from nerve endings of the central nervous system and the adrenal medulla. They act as...