Search Result for "passive immunity":
Wordnet 3.0

NOUN (1)

1. an impermanent form of acquired immunity in which antibodies against a disease are acquired naturally (as through the placenta to an unborn child) or artificially (as by injection of antiserum); 



WordNet (r) 3.0 (2006):

passive immunity
    n 1: an impermanent form of acquired immunity in which
         antibodies against a disease are acquired naturally (as
         through the placenta to an unborn child) or artificially
         (as by injection of antiserum)