A
strain of
bacteria, typically highly
pathogenic, that has been
genetically engineered so that it can't
survive on anything but a very specialized
medium of
nutrients; this is done so that
geneticists can
experiment on certain
pathogens without the risk that they will escape from the
lab.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.