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• a  of or relating to or shaped like a toroid; doughnut shaped

• With the bigger Princeton machine, known as the Tokamak Fusion Test Reactor (Tokamak is a Russian acronym for a toroidal, or doughnut-shaped, magnetic chamber), physicists hope to .

News & Articles

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• NASA was working on 'Elysium'-style space stations in 1975
  The NASA Ames Research Center created three different kinds of space colony concepts -- toroidal, bernal, and cylindrical -- in the summer of 1975, each showing space stations massive in size with large populations of people inhabiting them.
  Aug. 12, 2013 - Houston Chronicle