Columbia Encyclopedia

Search results

500 results found

pesticide

(Encyclopedia)pesticide, biological, physical, or chemical agent used to kill plants or animals that are harmful to people; in practice, the term pesticide is often applied only to chemical agents. Various pesticid...

photographic processing

(Encyclopedia)photographic processing, set of procedures by which the latent, or invisible, image produced when a photographic film is exposed to light is made into a permanent visible image. The negative may b...

witchcraft

(Encyclopedia)witchcraft, a form of sorcery, or the magical manipulation of nature for self-aggrandizement, or for the benefit or harm of a client. This manipulation often involves the use of spirit-helpers, or fam...

wood

(Encyclopedia)CE5 Wood A. Cross section of a woody stem B. Enlarged view, showing xylem, phloem, and cambium wood, botanically, the xylem tissue that forms the bulk of the stem of a woody plant. Xylem conducts ...

canoe

(Encyclopedia)canoe kəno͞oˈ [key], long, narrow watercraft with sharp ends originally used by most peoples. It is usually propelled by means of paddles, although sails and, more recently, outboard motors are als...

Russian language

(Encyclopedia)Russian language, also called Great Russian, member of the East Slavic group of the Slavic subfamily of the Indo-European family of languages (see Slavic languages). The principal language of administ...

tire

(Encyclopedia)tire, device made of rubber and fabric and attached to the outer rim of a vehicle wheel. Solid rubber tires were in limited use before 1850; they are still used in some special applications, e.g., for...

Grass, Günter

(Encyclopedia)Grass, Günter günˈtər gräs [key], 1927–2015, German novelist, lyricist, artist, and playwright, b. Danzig (now Gdańsk, Poland). Writing from his experience in the Hitler Youth, the German army...

palm

(Encyclopedia)palm, common name for members of the Palmae, a large family of chiefly tropical trees, shrubs, and vines. Most species are treelike, characterized by a crown of compound leaves, called fronds, termina...

information theory

(Encyclopedia)information theory or communication theory, mathematical theory formulated principally by the American scientist Claude E. Shannon to explain aspects and problems of information and communication. Whi...