Parasite
Meaning
An organism that lives in or on another organism, called the host, and benefits by deriving nutrients at the host's expense.
Origin
Imagine ancient Greece, where the word parasitos didn't initially carry a scientific or negative sting. It literally meant 'one who eats beside' or 'one who feeds at another's table,' from para- ('beside') and sitos ('food'). These were often professional guests, welcomed into homes to entertain or offer flattery in exchange for a meal—a kind of social dependent. As the centuries turned, this image of someone living off another's sustenance broadened. When the word eventually made its way into English, it retained that core idea of a hanger-on. By the 17th century, it was clearly applied to organisms that literally fed off a host, cementing its scientific meaning and the more negative, exploitative connotations we recognize today.
Examples
- Fleas are common parasites that can infest pets, causing itching and discomfort.
- The critic argued that some reality television stars were merely social parasites, feeding off public attention without offering any real talent.