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> vt, pas*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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