Definition

1. Noun:
   • A relationship between two different organisms where one (the parasite) lives on or in the other (the host), deriving benefit from it while causing harm, typically without immediately killing it. This is the primary biological and ecological meaning.
   • A similar exploitative relationship between people or groups, where one benefits at the expense of another. This is a figurative extension of the biological term, describing a one-sided, dependent, and harmful association.

Usage

• Noun:
  • The study focused on the parasitism of tapeworms in the mammalian digestive system.
  • The novel critiques the social parasitism of the aristocracy, who lived off the labor of the peasantry.

Advanced Usage

• "Obligate parasitism": A form of parasitism where the parasite cannot complete its life cycle without exploiting a suitable host.
  • Viruses are classic examples of obligate parasitism.
• "Facultative parasitism": A relationship where an organism, normally free-living, can adopt a parasitic lifestyle under certain conditions.
  • Some fungi exhibit facultative parasitism, living in the soil but infecting plants when the opportunity arises.

Variants and Related Words

• Parasite (n): The organism that benefits in a parasitic relationship.
  • The tick is a common external parasite.
• Parasitic (adj): Having the nature of or relating to a parasite.
  • The plant has a parasitic lifestyle, drawing nutrients from tree roots.
• Parasitize (v): To live as a parasite on or in (a host).
  • The wasp larvae parasitize caterpillars.

Synonyms

• Exploitation: The action of making use of and benefiting from resources, often unfairly. (Closer to the figurative sense).
• Dependence: The state of relying on someone or something, often with a negative connotation of being a burden.

Related Phrases / Idioms

• Social parasite: A person who habitually relies on or exploits others while contributing nothing themselves. (This is a direct figurative use of the biological term).
  • He was accused of being a social parasite, living off his family's wealth without seeking employment.

Noun

1. 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)