Synonyms:
parasite
Meaning: an animal or plant that lives in or on a host (another animal or plant); it obtains nourishment from the host without benefiting or killing the host
Usage examples
Animal life from one point of view is a parasite, living on the vegetable; it is only the vegetable that has power to assimilate most inorganic compounds.
It seems clear that this parasite is not transferred from another host, and that its history is unlike that of any other known tapeworm--in fact, Atkinson scores a discovery in parasitology of no little importance.