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passage

n 1  :  the action or process of passing from one place, condition, or stage to another <the of air from the lungs -Encyc. Americana>   2  :  an anatomical channel <the nasal s>   3  :  a movement or an evacuation of the bowels  4 a  :  an act or action of passing something or undergoing a passing < of a catheter through the urethra>   b  :  incubation of a pathogen (as a virus) in a tissue culture, a developing egg, or a living organism to increase the amount of pathogen or to alter its characteristics <several s of the virus through mice> 
vtpas*saged  pas*sag*ing  :  to subject to passage <the virus has been passaged in series seven times -Jour. Amer. Med. Assoc.>  .
 
 

 
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