parasitism

A relationship between two organisms of different species in which one is a parasite and the other is a host.

The characteristic behavior or mode of existence of a parasite or parasitic population.

Parasitosis.

A habitual living on or at the expense of another; parasitic condition, tendency, or habits; a state of dependency on the favor or good offices of another.

Specifically In zoology and botany, the vital relation which a parasite bears to its host; parasitic infestation.

The state or behavior of a parasite; the act of a parasite.

The state of being parasitic.

Interaction between two organisms, in which one organism (the parasite) benefits and the other (the host) is harmed.

A similar interaction between people.

the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)