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Medical Term:


Pronunciation: fil-tra'shun


  1. The process of passing a liquid or gas through a filter.
  2. In radiology, the process of attenuating and hardening a beam of x- or gamma rays by interposing a filter3 between the radiation source and the object being irradiated; inherent filtration is that which is caused by the apparatus itself, such as the glass of an x-ray tube, without addition of a filter.

Synonym(s): percolation1

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