x-ray tube

from WordNet (r) 3.0 (2006)

X-ray tube
    n 1: a vacuum tube containing a metal target onto which a beam
         of electrons is directed at high energy for the generation
         of X rays

from The Collaborative International Dictionary of English v.0.48

X-ray tube \X"-ray` tube\ (Physics)
   A vacuum tube suitable for producing Roentgen rays.
   [Webster 1913 Suppl.]

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