passive immunity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Immunity acquired by the transfer of antibodies from another individual, as through injection or placental transfer to a fetus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun immunology The translocation of active humoral immunity from one individual to another in the form of custom-made antibodies.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun 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)