A type of
symbiosis where two (or more)
organisms from different
species live in close proximity to one another, in which one member depends on another for its
nutrients, protection, and/or other
life functions. The dependent member (the
parasite) benefits from the relationship while the other one (the
host) is
harmed by it.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.