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Magdeburg hemisphere

noun Physics.
  1. one of a pair of hemispherical cups from which air can be evacuated when they are placed together: used to demonstrate the force of air pressure.
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Origin of Magdeburg hemisphere

after Magdeburg, where German statesman and physicist Otto von Guericke (1602–86) constructed a pair of such hemispheres
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018