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Pronunciation: pas'aj


  1. The act of passing.
  2. A discharge, as from the bowels or of urine.
  3. Inoculation of a series of animals with the same strain of a pathogenic microorganism whereby the virulence usually is increased, but is sometimes diminished.
  4. A channel, duct, pore, or opening.

[Mediev. L. passo, to pass]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.