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Medical Term:


Pronunciation: pas′ăj


  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]