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Tyson, Mike

(Encyclopedia)Tyson, Mike (Michael Gerald Tyson), 1966–, American boxer, b. Brooklyn, N.Y. At the age of 12, Tyson was sent to reform school, where he began to box. In a whirlwind career begun in 1985 when he tur...

Edison, Thomas Alva

(Encyclopedia)Edison, Thomas Alva, 1847–1931, American inventor, b. Milan, Ohio. A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his...

tinnitus

(Encyclopedia)tinnitus, the hearing of sounds in the absence of any external sound, also known as ringing in the ears. The sounds may be perceived as hissing, whistling, buzzing, swooshing, roaring, or clicking in ...

Fenian movement

(Encyclopedia)Fenian movement fēˈnēən [key] or Fenians, secret revolutionary society organized c.1858 in Ireland and the United States to achieve Irish independence from England by force. It was known variously...

salivary glands

(Encyclopedia)salivary glands sălˈəvârˌē [key], in humans, three pairs of glands that secrete the alkaline digestive fluid, saliva, into the mouth. Most animals have salivary glands that resemble those in hum...

corn borer

(Encyclopedia)corn borer or European corn borer, common name for the larva of a moth of the family Pyralidae, introduced from S Europe into the Boston area in 1917. The corn borer, Ostrinia nubilalis, has steadily ...

stethoscope

(Encyclopedia)stethoscope stĕthˈəskōpˌ [key] [Gr.,=chest viewer], instrument that enables the physican to hear the sounds made by the heart, the lungs, and various other organs. The earliest stethoscope, devis...

harmonic

(Encyclopedia)harmonic. 1 Physical term describing the vibration in segments of a sound-producing body (see sound). A string vibrates simultaneously in its whole length and in segments of halves, thirds, fourths, e...

Shaffer, Sir Peter

(Encyclopedia)Shaffer, Sir Peter shăfˈər [key], 1926–2016, English playwright, b. Liverpool, grad. Cambridge, 1950. Before turning to the stage he wrote for radio and television and was the author of several m...