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avalanche

(Encyclopedia)avalanche, rapidly descending large mass of snow, ice, soil, rock, or mixtures of these materials, sliding or falling in response to the force of gravity. Avalanches, which are natural forms of erosio...

winter cress

(Encyclopedia)winter cress or upland cress, species of Barbarea, herbs of the family Cruciferae (or Brassicaceae; mustard family). The pungent leaves of several species have been used for salads or garnishes, and t...

biopsy

(Encyclopedia)biopsy bīäpˈsē [key], examination of cells or tissues removed from a living organism. Excised material may be studied in order to diagnose disease or to confirm findings of normality. Preparatory ...

thermostat

(Encyclopedia)thermostat, automatic device that regulates temperature in an enclosed area by controlling heating or refrigerating systems. It is commonly connected to one of these systems, turning it on or off in o...

plywood

(Encyclopedia)plywood, manufactured board composed of an odd number of thin sheets of wood glued together under pressure with grains of the successive layers at right angles. Laminated wood differs from plywood in ...

barge

(Encyclopedia)barge, large boat, generally flat-bottomed, used for transporting goods. Most barges on inland waterways are towed, but some river barges are self-propelled. There are also sailing barges. On the Grea...

evening star

(Encyclopedia)evening star or morning star, planet that becomes visible in the western sky shortly after sunset or in the eastern sky shortly before sunrise. It can usually be seen in twilight, when it is too light...

incantation

(Encyclopedia)incantation, set formula, spoken or sung, for the purpose of working magic. An incantation is normally an invocation to beneficent supernatural spirits for aid, protection, or inspiration. It may also...

palpitation

(Encyclopedia)palpitation pălˌpĭtāˈshən [key], abnormal heartbeat that is often associated with a sensation of fluttering or thumping. The normal heartbeat is not noticeable to the individual. Palpitation may...

self-fulfilling prophecy

(Encyclopedia)self-fulfilling prophecy, a concept developed by Robert K. Merton to explain how a belief or expectation, whether correct or not, affects the outcome of a situation or the way a person (or group) will...