| Noun | 1. | parasite - an animal or plant that lives in or on a host (another animal or plant); the parasite obtains nourishment from the host without benefiting or killing the hostorganism, being - a living thing that has (or can develop) the ability to act or function independently parasitic plant - plant living on another plant and obtaining from it organic nutriment host - an animal or plant that nourishes and supports a parasite; the host does not benefit and is often harmed by the association | |