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maple

(Encyclopedia)maple, common name for the genus Acer of the Aceraceae, a family of deciduous trees and shrubs of the Northern Hemisphere, found mainly in temperate regions and on tropical mountain slopes. Acer, the ...

Vesta, in astronomy

(Encyclopedia)Vesta vĕsˈtə [key], in astronomy, the fourth asteroid to be discovered. It was found in 1807 by H. Olbers. It is the third largest asteroid in size, with a diameter of c.326 mi (525 km). Its averag...

folk medicine

(Encyclopedia)folk medicine, methods of curing by means of healing objects, herbs, or animal parts; ceremony; conjuring, magic, or witchcraft; and other means apart from the formalized practice of medical science. ...

virtual reality

(Encyclopedia)virtual reality (VR) or virtual environment (VE), computer-generated environment with and within which people can interact. The advantage of VR is that it can immerse people in an environment that wou...

Ferlinghetti, Lawrence

(Encyclopedia)Ferlinghetti, Lawrence fûrˈlĭng-gĕtˈē [key], 1919–2021, American author and publisher, b. Yonkers, N.Y, ...

Yorktown campaign

(Encyclopedia)Yorktown campaign, 1781, the closing military operations of the American Revolution. After his unsuccessful Carolina campaign General Cornwallis moved into Virginia to join British forces there. His l...

light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...

African art

(Encyclopedia)African art, art created by the peoples south of the Sahara. The predominant art forms are masks and figures, which were generally used in religious ceremonies. The decorative arts, especially in text...

ulcer

(Encyclopedia)ulcer, open sore or circumscribed erosion, usually slow to heal, on the skin or mucous membranes. It may develop as a result of injury; because of a circulatory disturbance, e.g., in varicose veins or...

Nietzsche, Friedrich Wilhelm

(Encyclopedia)Nietzsche, Friedrich Wilhelm frēˈdrĭkh vĭlˈhĕlm nēˈchə [key], 1844–1900, German philosopher, b. Röcken, Prussia. The son of a clergyman, Nietzsche studied Greek and Latin at Bonn and Leipz...