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quantum chromodynamics

(Encyclopedia)quantum chromodynamics (QCD), quantum field theory that describes the properties of the strong interactions between quarks and between protons and neutrons in the framework of quantum theory. Quarks p...

smallpox

(Encyclopedia)smallpox, acute, highly contagious disease causing a high fever and successive stages of severe skin eruptions. Occurring worldwide in epidemics, it killed up to 40% of those who contracted it and acc...

Newman, Barnett

(Encyclopedia)Newman, Barnett, 1905–70, American artist, b. New York City. A member of the New York school, Newman was one of the first to reject conventional notions of spatial composition in art. Often using mo...

ocelot

(Encyclopedia)ocelot äsˈəlŏtˌ, ōˈsə– [key], medium-sized cat, Leopardus pardalis, of Central and South America. It is occasionally found as far N as Texas. The ocelot has a yellow-brown coat with black sp...

monazite

(Encyclopedia)monazite mŏnˈəzīt [key], yellow to reddish-brown natural phosphate of the rare earths, mainly the cerium and lanthanum metals, usually with some thorium. Yttrium, calcium, iron, and silica are fre...

Lanzhou

(Encyclopedia)Lanzhou or Lanchow both: länˈjōˈ [key], city (1994 est. pop. 1,295,600), capital of Gansu prov., W China, on the Huang He (Yellow River) at its confluence with the Wei. It is a rail, highway, and ...

rosin

(Encyclopedia)rosin or colophony, hard, brittle, translucent resin, obtained as a solid residue from crude turpentine. Usually pale yellow or amber, its color may vary from brownish-black to transparent depending o...

sapote

(Encyclopedia)sapote səpōˈtā [key], name for several Central American trees and their fruits. Sapotes, sweet and pulpy, are commonly seen in tropical markets and are usually eaten fresh, although some are also ...

satinwood

(Encyclopedia)satinwood, name for a hard and durable wood with a satinlike sheen, much used in cabinetmaking, especially in marquetry. It comes from two tropical trees of the family Rutaceae (rue family). East Indi...

color blindness

(Encyclopedia)color blindness, visual defect resulting in the inability to distinguish colors. About 8% of men and 0.5% of women experience some difficulty in color perception. Color blindness is usually an inherit...