The species (or group of species) that a
parasite infects during its adult stage, when it is capable of reproducing. Many
parasites live in different
host species during different parts of their life cycles. Generally, the
parasite is most harmful to its
primary host. Compare
intermediate host.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.