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embolus

(Encyclopedia)embolus ĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas o...

Saratov

(Encyclopedia)Saratov səräˈtəf [key], city (1991 est. pop. 910,000), capital of Saratov region, E European Russia, on the Volga River. It is a major industrial, transportation, and cultural center of the lower ...

Nuuk

(Encyclopedia)Nuuk gôtˈhôp [key], town (1996 pop. 12,882), Nuuk dist., W Greenland, on the Godthåbfjord. The largest town and capital of Greenland, it is the seat of the national council and of the supreme cour...

Permian Basin

(Encyclopedia)Permian Basin or West Texas Basin, extensive sedimentary basin, West Texas and SE New Mexico. Covering an area of more than 75,000 sq mi (194,000 sq km), its main components are the Midland Basin on t...

Norilsk

(Encyclopedia)Norilsk nərēlskˈ [key], city (1989 pop. 175,000), Krasnoyarsk Territory, N Siberian Russia. The northernmost major city of Russia and the world's second largest city (after Murmansk) above the Arct...

Orion Nebula

(Encyclopedia)Orion Nebula, bright diffuse nebula in the constellation Orion; also known as the Great Nebula of Orion and cataloged as M42 or NGC 1976. It is located near the middle of the “sword” hanging from ...

Warri

(Encyclopedia)Warri wôˈrē [key], city (1991 est. pop. 111,000), S Nigeria, a port on the Warri River. It is a transshipment point where oceangoing vessels meet Niger River boats. The main items shipped from Warr...

sulfur dioxide

(Encyclopedia)sulfur dioxide, chemical compound, SO2, a colorless gas with a pungent, suffocating odor. It is readily soluble in cold water, sparingly soluble in hot water, and soluble in alcohol, acetic acid, and ...

butane

(Encyclopedia)butane byo͞oˈtān [key], C4H10, gaseous alkane, a hydrocarbon that is obtained from natural gas or by refining petroleum. It can be liquefied at room temperature by compression. There are two struct...

Bryansk

(Encyclopedia)Bryansk brēänskˈ [key], city (2020 est. pop. 399,000), capital of Bryansk region, central ...