Dependant: a person who relies on another, especially a family member, for financial support. Parasite: an organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other's expense. Symbiotic: involving interaction between two different organisms living in close physical association. Plebiscite: the direct vote of all the members of an electorate on an important public question such as a change in the constitution.