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dark horse

(Encyclopedia)dark horse, in U.S. politics, a person unexpectedly chosen by a major party as a candidate for public office, especially for the presidency. A presidential dark horse is usually chosen at a party nati...

Przewalski's horse

(Encyclopedia)Przewalski's horse pshəvälˈskēz [key], wild horse of Asia, Equus przewalski, E. ferus przewalski, or E. caballus przewalski, the only extant wild horse that, in the purebred state, is not descende...

pinto horse

(Encyclopedia)pinto horse, American light horse, characterized by large, irregular color markings—most commonly black (or dark) and white. Horses of this pattern, known regionally as “paints” [Span. pinto=pai...

Appaloosa horse

(Encyclopedia)Appaloosa horse ăpˌəlo͞oˈsə [key], breed of light horse developed in the United States by the Nez Percé of Idaho from a horse that originated in Asia and was popular in Europe during the Middle...

Dark Ages

(Encyclopedia)Dark Ages: see Middle Ages.

dark energy

(Encyclopedia)dark energy, repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was triggered by the discov...

dark matter

(Encyclopedia)dark matter, material that is believed to make up nearly 27% of the mass of the universe but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or ra...

horse

(Encyclopedia)CE5 General anatomy of a horse horse, hoofed, herbivorous mammal now represented by a single extant genus, Equus. The term horse commonly refers only to the domestic Equus caballus and to the wild...

dark-line spectrum

(Encyclopedia)dark-line spectrum: see spectrum. ...

draft horse

(Encyclopedia)draft horse or work horse, any breed of horse that is suited to or used for drawing heavy loads. Draft horses originated in central Europe, where their domestication preceded the Roman invasion. Popul...