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dark adaptation
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chiaroscuro
chiaroscuro [Ital.,=light and dark], term once applied to an early method of printing woodcuts from several blocks and also to works in black and white or monotone. Today it is used loosely to refer to the distribution of light and dark in painting.... Read more |
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Erebus
Erebus , in Greek religion and mythology, personification of darkness. According to Hesiod, Erebus sprang from Chaos and was the father of Day. His name was sometimes used for Hades.... Read more |
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dark energy
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 discovery (1998) in images from the Hubble Space Telescope of a distant supernova that implied an... Read more |
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dark matter
dark matter material that is believed to make up (along with dark energy ) more than 90% of the mass of the universe but is not readily visible because it neither emits nor reflects electromagnetic radiation , such as light or radio signals. Its existence would explain gravitational anomalies... Read more |
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Birthmarks
Birthmarks Definition Birthmarks are areas of discolored and raised spots found on the skin. Birthmarks are groups of malformed pigment cells or blood vessels. Description Vascular birthmarks are benign (noncancerous) skin growths comprised of rapidly growing or poorly... Read more |
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sea snake
sea snake name for any of the venomous marine snakes of the family Hydrophidae, found in tropical waters of the Indian and Pacific oceans. The sea snake's body is flattened laterally and its oarlike tail is used as a scull. A specialized lung and nostrils with valves enable it to remain... Read more |
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Cutaneous T-Cell Lymphoma
Cutaneous T-cell lymphoma Definition Cutaneous T-cell lymphoma (CTCL) is a malignancy of the T helper (CD4+) cells of the immune system. Description CTCL is a cancer of the white blood cells that primarily affects the skin and only secondarily affects other sites. The disease... Read more |
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Phyllite
Phyllite Phyllite is an intermediate-grade, foliated metamorphic rock type that resembles its sedimentary parent rock , shale, and its lower-grade metamorphic counterpart, slate . Like slate, phyllite can be distinguished from shale by its foliation, called slaty cleavage, and its brittleness,... Read more |
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Darkness
110. Darkness See also 47. BLACKENING and BLACKNESS ; 292. NIGHT . achluphobia an abnormal fear of darkness. Also called scotophobia . fuliginosity 1. the state or condition of being sooty or smoky. 2. soot or smoke. |
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